Lighting devices with illumination regions having different gamut properties

TECHNICAL FIELD

0001Subject matter herein relates to lighting devices, including specific embodiments directed to systems and methods utilizing one or more electrically activated state emitters, and relates to associated methods of making and using lighting devices.

BACKGROUND

0002Various types of lighting technologies are known, including incandescent, fluorescent, high intensity discharge, and solid state sources. Solid state emitters such as light-emitting diodes (LEDs) or lasers may be used to provide white light (e.g., perceived as being white or near-white), and are increasingly attractive as replacements for incandescent lamps. Solid state emitters may include lumiphoric materials (also known as lumiphors) that absorb a portion of emissions having a first peak wavelength emitted by the emitter and re-emit light having a second peak wavelength that differs from the first peak wavelength. Phosphors, scintillators, and lumiphoric inks are common lumiphoric materials. Light perceived as white or near-white may be generated by a combination of red, green, and blue (“RGB”) emitters, or by emissions of a blue emitting LED in combination with a lumiphor such as a yellow phosphor (e.g., YAG:Ce or Ce:YAG). In the latter case, a portion of the blue LED emissions pass through the phosphor, while another portion of the blue emissions is downconverted to yellow, and the blue and yellow light in combination are perceived as white. White light may also be produced by stimulating phosphors or dyes of multiple colors with a violet or ultraviolet (UV) LED source.

0003Emissions of a blue LED in combination with a yellow or green lumiphoric material may be near-white in character and referred to as “blue-shifted yellow” (BSY) light or “blue-shifted green” (BSG) light. Addition of red spectral output from a red-emitting LED (to yield a BSY+R device) or from a red lumiphoric material (to yield a BS(Y+R) device) may be used to increase the warmth of the aggregated light output and better approximate light produced by incandescent lamps.

0004It is known to enclose a LED chip in a package to provide environmental and/or mechanical protection, color selection, light focusing and other functions. A LED package also includes electrical leads, contacts, and/or traces for electrically connecting the LED package to an external circuit. A conventional two-pin LED package/component <b>10</b> is illustrated in <figref idref="DRAWINGS">FIG. 1</figref>, including a single LED chip <b>12</b> mounted on a reflective cup <b>13</b> with a solder bond or epoxy (which may be conductive). One or more wire bonds <b>11</b> may connect the ohmic contacts of the LED chip <b>12</b> to leads <b>15</b>A and/or <b>15</b>B, which may be attached to or integrated with the reflective cup <b>13</b>. The LED package illustrated in <figref idref="DRAWINGS">FIG. 1</figref> may include a vertically oriented LED chip <b>12</b> with a conductive growth substrate (p-side up in a group III-nitride LED) or conductive carrier substrate (n-side up) and one wire bond <b>11</b>. In alternative implementations, a LED component may include a laterally oriented LED chip on an insulating substrate with two wire bonds <b>11</b>. In other implementations involving use of one or more “flip” chips, the need for wire bonds <b>11</b> may be eliminated. A transparent encapsulant material <b>16</b> may be provided in the reflective cup <b>13</b>. A wavelength conversion material, such as a phosphor or other lumiphoric material, may be mixed with the encapsulant or otherwise arranged over the LED chip <b>12</b>. Light emitted by the LED at a first wavelength may be absorbed by the wavelength conversion material, which may responsively emit light at a second wavelength. The assembly can be further covered with a clear protective resin <b>14</b>, which may be molded in the shape of a lens to direct or shape the light emitted by the LED chip <b>12</b> and/or wavelength conversion material.

0005Another conventional LED package <b>20</b> is illustrated in <figref idref="DRAWINGS">FIG. 2</figref>, with the LED package <b>20</b> being suitable for high power operations with increased thermal dissipation requirements. One or more LED chips <b>22</b> are mounted over a carrier such as a printed circuit board (PCB) carrier, substrate, or submount <b>23</b>, which may include ceramic material. The LED package <b>20</b> may include one or more LED chips <b>22</b> of any suitable spectral output (e.g., ultraviolet, blue, green, red, white (such as may include a blue LED chip and one or more phosphors) and/or other colors). A reflector <b>24</b> may be mounted on the submount <b>23</b> to surround the LED chips <b>22</b> to reflect light emitted by the LED chips <b>22</b> away from the LED package <b>20</b>, and to provide mechanical protection to the LED chips <b>22</b>. One or more wirebond connections <b>21</b> may be made between ohmic contacts on the LED chips <b>22</b> and electrical traces <b>25</b>A, <b>25</b>B on the submount <b>23</b>. The LED chips <b>22</b> are covered with a transparent encapsulant material <b>26</b>, which may provide protection and/or light shaping utility.

0006Quality artificial lighting generally attempts to emulate the characteristics of natural light. Natural light sources include daylight with a relatively high color temperature (e.g., ˜5000K) and incandescent lamps with a lower color temperature (e.g., ˜2800K).

0007Color reproduction is commonly measured using Color Rendering Index (CRI) or average Color Rendering Index (CRI Ra). To calculate CRI, the color appearance of 14 reflective samples is simulated when illuminated by a reference radiator (illuminant) and the test source. CRI Ra is a modified average utilizing the first eight indices, all of which have low to moderate chromatic saturation (R9 is one of six saturated test colors not used in calculating CRI, with R9 embodying a large red content.) CRI and CRI Ra are used to determine how closely an artificial light source matches the color rendering of a natural light source at the same correlated color temperature. Daylight has a high CRI Ra (approximately 100), with incandescent bulbs also being relatively close (CRI Ra greater than 95), and fluorescent lighting being less accurate (with typical CRI Ra values of approximately 70-80).

0008CRI Ra (or CRI) alone is not a satisfactory measure of the benefit of a light source, since it confers little ability to predict color discrimination (i.e., to perceive subtle difference in hue) or color preference. There appears to be a natural human attraction to brighter color. Daylight provides a spectrum of light that allows the human eye to perceive bright and vivid colors, which allows objects to be distinguished even with subtle color shade differences. Accordingly, it is generally recognized that daylight is the “best” light for emphasizing and distinguishing color. The ability of human vision to differentiate color is different under correlated color temperature conditions providing the same CRI Ra. Such differentiation is proportional to the gamut of the illuminating light.

0009Gamut area of a light source can be calculated as the area enclosed within a polygon defined by the chromaticities in CIE 1976 u′v′ color space of the eight color chips used to calculate CRI Ra when illuminated by a test light source. Gamut Area Index (GAI) is a convenient way of characterizing in chromaticity space how saturated the illumination makes objects appear, with a larger GAI making object colors appear more saturated. GAI is a relative number whereby an imaginary equal-energy spectrum (wherein radiant power is equal at all wavelengths) is scored as 100. GAI for a test source is determined by comparing color space area of the light being tested to the color space area produced by the imaginary or theoretical equal-energy spectrum (EES) source. Unlike CRI Ra (or CRI), which has a maximum value of 100, GAI can exceed 100, meaning that some sources saturate colors more than an equal-energy source serves to saturate color.

0010It is found that typical blackbody-like light sources and typical daylight-like light sources have different gamut areas. Low correlated color temperature (CCT) sources (e.g., incandescent emitters) have a gamut area index of approximately 50% (i.e., about half the gamut area of the EES source). Sources with higher CCT values have a larger GAI. For example, a very bluish light with a CCT of 10,000K may have a GAI of 140%.

0011Another way of characterizing how saturated an illuminant makes objects appear is relative gamut area, or Q_g, which is the area formed by the (a*, b*) coordinates of the 15 test-color samples in CIELAB normalized by the gamut area of a reference illuminant at the same CCT and multiplied by 100. Like GAI, Q_gvalues can exceed 100. Because of chromatic adaptation, and because CCT is selected to set the overall color tone of an environment as part of the lighting design process, variable-reference measures such as Q_gmay be especially relevant to applied lighting design. If the relative gamut is greater than that of the reference, and illuminance is lower than that provided by daylight, then an increase in preference and discrimination might be expected relative to the reference at that same CCT. Conversely, if the relative gamut is smaller than that of the reference, then a decrease in preference and discrimination might be expected relative to the reference at the same CCT.

0012The reference spectra used in color rendering index calculations were chosen as ideal illumination sources defined in terms of their color temperature. As a heated object becomes incandescent, it first glows reddish, then yellowish, then white, and finally bluish. Thus, apparent colors of incandescing materials are directly related to their actual temperature in Kelvin (K). Practical materials that incandesce are said to have CCT values that are directly related to color temperatures of blackbody sources. CCT is intended to characterize the apparent “tint” of the illumination (e.g., warm or cool) produced by an electric light source. Certain implicit assumptions are embedded in this CCT designation—such as the assumption that chromaticities along the line of blackbody radiation are perceived as “white”, and that a CCT designation for a manufactured light source implies consistency in chromaticities of all sources having that designation. Recent research suggests, however, that most sources with chromaticities along the line of blackbody radiation do not appear “white”; rather, such sources provide illumination with discernible tint. An empirically established line of minimum tint in CIE 1931 (x,y) chromaticity space for CCTs between 2700K and 6500K is shown in <figref idref="DRAWINGS">FIG. 3</figref>. Researchers have determined that a majority of people prefer sources of illumination on this “white body line” (i.e., line of minimum tint) more than those of the same CCT line of blackbody radiation. (See, e.g., Rea, M. S. and Freyssinier, J. P.: White lighting for residential applications, Light Res. Tech., 45(3), pp. 331-344 (2013).) As shown in <figref idref="DRAWINGS">FIG. 3</figref>, at CCT values below about 4000K, the “white body line” (WBL) is below the blackbody curve, whereas at higher CCT values, the WBL is above the blackbody curve.

0013Rea and Freyssinier have proposed that lighting could be generally improved by ensuring that its CRI Ra value is at least 80 while its GAI is in a range of from 80 to 100 (i.e., from 80% to 100% of an EES), such as represented by the shaded region in <figref idref="DRAWINGS">FIG. 4</figref>.

0014Characteristics including CCT, CRI Ra, GAI, CIE 1931 (x,y) coordinates, luminous efficacy (lm/W), and scotopic/photopic (S/P) ratios for eighteen different light sources are tabulated in <figref idref="DRAWINGS">FIG. 5A</figref>, and chromaticities for selected sources of the foregoing eighteen light sources are plotted in <figref idref="DRAWINGS">FIG. 5B</figref> together with the blackbody curve and the WBL (line of minimum tint). (Source: “Value Metrics for Better Lighting,” Rea, Mark S., et al., 2013, pp. 54 &amp; 63, SPIE Press (Bellingham, Wash., US), ISBN 978-0-8194-9322-4.) As indicated in <figref idref="DRAWINGS">FIG. 5A</figref>, the ability of artificial lights to accurately illuminate color objects, as well as the gamut area provided by artificial lights, varies enormously by type.

0015Solid state emitters such as LEDs, in combination with lumiphors, create white light by mixing relatively narrow wavelength bands together with spectral gaps between peaks of LEDs and/or lumiphors. The resulting light may be under-saturated with certain colors of the spectrum or oversaturated with certain colors. One way to alleviate oversaturation with respect to certain portions of the visible spectrum, and thereby improve CRI, includes notch filtering of LED lighting systems with an optical element (e.g., incorporating a rare earth compound such as neodymium oxide, or a color pigment) that filters light emissions so that light passing through or reflected by the optical element exhibits a spectral notch, as disclosed in U.S. Patent Application Publication No. 2013/0170199 A1 entitled “LED lighting using spectral notching” (which is hereby incorporated by reference herein). Such publication discloses that CRI and GAI values of LED light sources can be improved through use of notch filtering, such as to increase CRI from 84 to 90, and to increase GAI from 50 to 58. Alternatively, careful selection of materials used in LED lighting devices may permit attainment of CRI Ra values of 90 to 95 or more, as disclosed in U.S. Pat. No. 7,213,940 (which is hereby incorporated by reference).

0016Usage of notch filtered light sources (such as widely available General Electric Reveal® incandescent light bulbs) or unfiltered light sources may be a matter of personal preference. Additionally, such preference may depend on the object(s) or surfaces to be illuminated, and/or the presence or absence of natural light such as may enter an interior space through one or more windows at certain times of day. It can be challenging to accommodate context-dependent and/or surface-dependent preferences when selecting artificial light sources. It can also be challenging to vividly illuminate objects without causing adjacent surfaces, such as walls, to be illuminated with an unnatural tint.

0017The art continues to seek improved lighting devices providing desirable illumination characteristics that are capable of overcoming challenges associated with conventional lighting devices.

SUMMARY

0018The present disclosure relates in various aspects to lighting devices with multiple light-emitting regions to transmit or reflect emission portions having different gamut properties (e.g., gamut area index (GAI) values differing by at least 10%, by at least 15%, or another threshold disclosed herein, or relative gamut (Q_g) values differing by at least 5%, by at least 10%, by at least 15%, or another threshold disclosed herein). In certain aspects, different light-emitting regions may be arranged to transmit emission portions or light beams having different GAI or Q_gvalues in different directions (e.g., a vertical direction and a horizontal direction, or another combination of directions), such as may include a first beam or group of beams centered in a first direction, and a second beam or group of beams centered in a second direction that differs from the first direction. In certain aspects, different light-emitting regions may include one or more light-affecting materials arranged to differently transmit or reflect light. The present disclosure relates in further aspects to lighting devices with multiple electrically activated light emitters having different gamut properties (e.g., GAI values differing by at least 10%, by at least 15%, or another threshold disclosed herein, or Q_gvalues differing by at least 5%, by at least 10%, by at least 15%, or another threshold disclosed herein), wherein emitters or groups of emitters with different gamut properties are arranged to illuminate different regions of a light output surface or area of the lighting device. In certain aspects, a first emitter or emitter group (e.g., arranged to produce a first mixture of light including a first color point) and a second emitter or emitter group (e.g., arranged to produce a second mixture of light including a second color point) may be separately arranged to produce white light with different gamut areas and/or relative gamut values, and the different mixtures of light may be transmitted or reflected in different directions. A color point of one or more beams or emission portions having different gamut properties of a lighting device may be on or proximate to the blackbody locus or the white body line (or line or minimum tint). In certain aspects, electrically activated emitters may include solid state emitters, such as light-emitting diodes (LEDs), optionally arranged to stimulate emissions of one or more lumiphoric materials. A lighting device with different gamut regions may preferably be devoid of any non-lumiphor-converted electrically activated solid state blue light emitter.

0019In one aspect, a lighting device includes: at least one electrically activated light emitter; a first light-emitting region arranged to transmit or reflect at least a first portion of emissions of the least one electrically activated light emitter in a first direction, wherein the at least a first portion of emissions comprises a first GAI value; and a second light-emitting region arranged to transmit or reflect at least a second portion of emissions of the least one electrically activated light emitter in a second direction, wherein the at least a second portion of emissions comprises a second GAI value; wherein the second GAI value differs from the first GAI value by at least 10%. In certain aspects, the preceding GAI threshold may be replaced with one or more Q_gvalues or other GAI values as disclosed herein.

0020In another aspect, a lighting device includes: at least one first electrically activated light emitter arranged to produce, in the absence of any additional light, emissions having a first gamut area index (GAI) value; and at least one second electrically activated light emitter arranged to produce, in the absence of any additional light, emissions having a second gamut area index (GAI) value, wherein the second GAI value differs from the first GAI value by at least 10%; wherein the at least one first electrically activated emitter is arranged to illuminate a first region of a light output surface or area of the lighting device; and wherein the at least one second electrically activated emitter is arranged to illuminate a second region of a light output surface or area of the lighting device. In certain aspects, the preceding GAI threshold may be replaced with one or more Q_gvalues or other GAI values as disclosed herein.

0021In another aspect, the present disclosure relates to a retrofit element for a lighting device that includes a light output surface or area, the retrofit element including an attachment structure arranged for removable attachment to the lighting device, and a light-affecting material supported by the attachment structure and arranged to span across a portion of the light output surface or area, wherein the light-affecting material is arranged to receive emissions from the lighting device having a first GAI value, interact with the received emissions to produce gamut-altered emissions having a second GAI value by at least 10%, and transmit the gamut-altered emissions to exit the retrofit element. In certain aspects, the preceding GAI threshold may be replaced with one or more relative gamut (Q_g) values or other GAI values as disclosed herein.

0022In additional aspects, the present disclosure relates to light fixtures and light bulbs incorporating lighting devices or retrofit elements as described herein.

0023In another aspect, the present disclosure relates to a method comprising illuminating an object, a space, or an environment, utilizing a solid state lighting device, or utilizing a lighting device and retrofit element, as described herein.

0024In another aspect, any of the foregoing aspects, and/or various separate aspects and features as described herein, may be combined for additional advantage. Any of the various features and elements as disclosed herein may be combined with one or more other disclosed features and elements unless indicated to the contrary herein.

0025Other aspects, features and embodiments of the present disclosure will be more fully apparent from the ensuing disclosure and appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

0026<figref idref="DRAWINGS">FIG. 1</figref> is a side cross-sectional view of a first conventional LED package.

0027<figref idref="DRAWINGS">FIG. 2</figref> is a side cross-sectional view of a second conventional LED package.

0028<figref idref="DRAWINGS">FIG. 3</figref> is an excerpt of a CIE 1931 chromaticity diagram showing the blackbody locus and including a line of minimum tint (or “white body line”) extending between CCT values of from 2700K to 6500K.

0029<figref idref="DRAWINGS">FIG. 4</figref> is a two dimensional plot of gamut area index (GAI) and average color rendering index (CRI Ra) including a shaded region at upper right representing a preferred combination of CRI Ra≧80 and 80≦GAI≦100.

0030<figref idref="DRAWINGS">FIG. 5A</figref> is a chart including CCT, CRI Ra, GAI, CIE 1931 (x,y) coordinates, luminous efficacy (lm/W), and scotopic/photopic (S/P) ratios for eighteen different light sources.

0031<figref idref="DRAWINGS">FIG. 5B</figref> is an excerpt of a CIE 1931 chromaticity diagram showing the blackbody locus, the line of minimum tint (or “white body line”) extending between CCT values from 2700K to 6500K, and (x,y) coordinate plots for selected sources of the eighteen light sources listed in <figref idref="DRAWINGS">FIG. 5A</figref>.

0032<figref idref="DRAWINGS">FIG. 6A</figref> is a schematic elevation view of an interior space including an overhead (e.g., ceiling-mounted) electrically activated light source arranged to illuminate an indoor environment with light beams propagating in different directions, and with dashed lines demarking regions having different gamut properties (e.g., gamut area and/or relative gamut values).

0033<figref idref="DRAWINGS">FIG. 6B</figref> is a schematic elevation view of the overhead electrically activated light source depicted in <figref idref="DRAWINGS">FIG. 6A</figref>.

0034<figref idref="DRAWINGS">FIG. 7</figref> is a side cross-sectional view of at least a portion of a lighting device including electrically activated light sources (e.g., preferably having different gamut properties) oriented on differently-angled surfaces of a support structure to emit beams in different directions, with light transition regions and/or light blocking elements arranged between adjacent light sources.

0035<figref idref="DRAWINGS">FIG. 8</figref> is a side cross-sectional view of at least a portion of a lighting device including groups of electrically activated light sources (e.g., preferably having different gamut properties between groups thereof) oriented on different portions of a substantially planar substrate, with transition/light blocking elements and/or light-affecting materials arranged between adjacent groups of light sources, and with at least one optical element arranged to direct at least substantial portions of emissions of different light source groups in different directions.

0036<figref idref="DRAWINGS">FIG. 9</figref> is a side cross-sectional view of at least a portion of a lighting device including electrically activated light sources (e.g., preferably having different gamut properties) arranged to emit light in different directions.

0037<figref idref="DRAWINGS">FIG. 10</figref> is a side cross-sectional view of at least a portion of a direct emission lighting device including at least one transmissive light-affecting region and arranged to output light with different gamut properties in different directions.

0038<figref idref="DRAWINGS">FIG. 11A</figref> is a side cross-sectional view of at least a portion of a reflected emission lighting device including one or more light-affecting regions (e.g., providing filtering and/or wavelength conversion utility) to yield light output regions arranged to output light with different gamut properties in different directions.

0039<figref idref="DRAWINGS">FIG. 11B</figref> is a top plan view of a portion of the lighting device of <figref idref="DRAWINGS">FIG. 11A</figref> taken along view lines “A”-“A”.

0040<figref idref="DRAWINGS">FIG. 11C</figref> is an upper perspective view of a sub-portion of the lighting device of <figref idref="DRAWINGS">FIG. 11A</figref> and portion of <figref idref="DRAWINGS">FIG. 11B</figref>.

0041<figref idref="DRAWINGS">FIG. 12A</figref> is a side elevation view of a direct emission lighting device including a centrally arranged light-affecting element disposed outside a reflector cavity to affect a central portion of emissions of the lighting device.

0042<figref idref="DRAWINGS">FIG. 12B</figref> is a side elevation magnified view of a portion of the lighting device of <figref idref="DRAWINGS">FIG. 12A</figref>.

0043<figref idref="DRAWINGS">FIG. 12C</figref> is a side elevation view of another direct emission lighting device similar to <figref idref="DRAWINGS">FIG. 12A</figref> but including a centrally arranged light-affecting element disposed outside a reflector cavity to affect a central portion of emissions of the lighting device.

0044<figref idref="DRAWINGS">FIG. 12D</figref> is a side elevation view of another direct emission lighting device similar to <figref idref="DRAWINGS">FIG. 12A</figref> but including a peripherally arranged light-affecting element disposed outside a reflector cavity to affect a peripheral portion of emissions of the lighting device.

0045<figref idref="DRAWINGS">FIG. 13A</figref> is an upper perspective view of a reflected emission lighting device.

0046<figref idref="DRAWINGS">FIG. 13B</figref> is a side cross-sectional view of a portion of a reflected emission lighting device consistent with <figref idref="DRAWINGS">FIG. 13A</figref>, with the lighting device including a centrally arranged light-affecting element positioned in or on a reflector, and including medially arranged light-affecting elements positioned in or along light-transmissive plates.

0047<figref idref="DRAWINGS">FIG. 13C</figref> is a side cross-sectional view of a portion of a reflected emission lighting device consistent with <figref idref="DRAWINGS">FIG. 13A</figref>, with the lighting device including one or more light-affecting elements positioned in or on a reflector, and including centrally or medially arranged light-affecting elements mounted to heatsink and/or trim structures.

0048<figref idref="DRAWINGS">FIG. 14</figref> is a side cross-sectional view of a lighting device embodying an emitter package including a dome-type lens with a centrally arranged light-affecting element.

0049<figref idref="DRAWINGS">FIG. 15</figref> is a side cross-sectional view of a pendant mount direct lighting device embodying a centrally-arranged light-affecting element positioned on a diffuser.

0050<figref idref="DRAWINGS">FIG. 16</figref> is an elevation view of a lighting device embodied in a light bulb including a centrally arranged light-affecting region arranged in or on a hemispherical globe, with an abrupt transition between the centrally arranged light-affecting region and a peripheral region.

0051<figref idref="DRAWINGS">FIG. 17</figref> is an elevation view of a lighting device embodied in a light bulb including a centrally arranged light-affecting region arranged in or on a hemispherical globe, with a sawtooth or feathered transition between the centrally arranged light-affecting region and a peripheral region.

0052<figref idref="DRAWINGS">FIG. 18</figref> is an elevation view of a lighting device embodied in a light bulb including a centrally arranged light-affecting region arranged in or on a hemispherical globe, with a stepped or gradient transition between the centrally arranged light-affecting region and a peripheral region.

0053<figref idref="DRAWINGS">FIG. 19A</figref> is a perspective view of a lighting device embodied in a reflector-type light bulb including a centrally arranged light-affecting region arranged in or on a lens or cover portion of the bulb.

0054<figref idref="DRAWINGS">FIG. 19B</figref> is a top plan view of a circular lens or cover portion of a light bulb including a centrally arranged light-affecting region disposed therein or thereon, with a stepped or gradient transition between the centrally arranged light-affecting region and a peripheral region.

0055<figref idref="DRAWINGS">FIG. 19C</figref> is a top plan view of a circular lens or cover portion of a light bulb including a centrally arranged light-affecting region disposed therein or thereon, with a sawtooth or feathered transition between the centrally arranged light-affecting region and a peripheral region.

0056<figref idref="DRAWINGS">FIG. 20</figref> is a simplified side cross-sectional view of at least a portion of a lighting device embodied in a light bulb including a peripherally arranged light-affecting region disposed in or on a hemispherical cover or globe.

0057<figref idref="DRAWINGS">FIG. 21</figref> is a side cross-sectional view of a lighting device embodied in a light bulb including a centrally arranged light-affecting region disposed within or under a hemispherical cover or globe.

0058<figref idref="DRAWINGS">FIG. 22</figref> is an elevation view of a lighting device embodied in a light bulb including multiple electrically activated light emitters supported by a central support column (e.g., preferably having different gamut properties between different emitters or groups thereof).

0059<figref idref="DRAWINGS">FIG. 23A</figref> is a perspective view of a non-planar, substantially flower-shaped light-affecting structure arranged to be positioned between electrically activated light emitters and a lens or diffuser of a lighting device.

0060<figref idref="DRAWINGS">FIG. 23B</figref> is a top plan view of the light-affecting structure of <figref idref="DRAWINGS">FIG. 23A</figref>.

0061<figref idref="DRAWINGS">FIG. 23C</figref> is a side cross-sectional view of at least a portion of a lighting device including the light-affecting structure of <figref idref="DRAWINGS">FIGS. 23A-23B</figref> positioned between electrically activated light emitters and a lens or diffuser.

0062<figref idref="DRAWINGS">FIG. 24</figref> is a side cross-sectional view of at least a portion of another lighting device including a base-supported centrally arranged light-affecting structure arranged to be positioned between electrically activated light emitters and a lens or diffuser.

0063<figref idref="DRAWINGS">FIG. 25</figref> is a side cross-sectional view of at least a portion of another lighting device including a lens- or diffuser-supported centrally arranged light-affecting structure arranged to be positioned between electrically activated light emitters and a lens or diffuser.

0064<figref idref="DRAWINGS">FIG. 26A</figref> is a side cross-sectional view of a retrofit element for a lighting device that includes a light-affecting material supported by an attachment structure, wherein the attachment structure is arranged for removable attachment to a base or body structure of a light bulb.

0065<figref idref="DRAWINGS">FIG. 26B</figref> is a side cross-sectional view of the retrofit element of <figref idref="DRAWINGS">FIG. 26A</figref> attached to a base or body structure of a light bulb.

0066<figref idref="DRAWINGS">FIG. 27</figref> is a plot of radiant flux versus wavelength for a spectral output of a solid state light-emitting device with superimposed notch filtered spectral output.

0067<figref idref="DRAWINGS">FIG. 28</figref> depicts spectral transmittance versus wavelength for an illustrative color pigment material.

DETAILED DESCRIPTION

0068As noted previously, the art continues to seek lighting devices providing desirable illumination characteristics. Subject matter disclosed herein relates to lighting devices arranged to transmit or reflect emission portions having different gamut properties in different directions (e.g., with different beams or groups of beams centered in different directions), and/or to illuminate different light output surfaces or areas of a lighting device. Such different gamut properties may include gamut area index (GAI) values differing by at least 10%, by at least 15%, or another threshold disclosed herein, and/or relative gamut (Q_g) values differing by at least 5%, by at least 10%, by at least 15%, or another threshold disclosed herein. Emission portions having different gamut properties may be attained in different ways, including use of electrically activated emitters having different gamut properties, and/or use of light-affecting materials (e.g., filters, pigments, lumiphors, and the like) having different gamut properties and applied to emitters, reflectors, or light-transmissive elements. Different presence, amount, and/or patterning may be used to adjust light-affecting characteristics of one or more light-affecting materials.

0069Subject matter disclosed herein also relates to retrofit elements for lighting devices, with an exemplary retrofit element including an attachment structure arranged for removable attachment to a light device, and a light-affecting material supported by the attachment structure and arranged to span across a portion of a light output surface or area of the lighting device, wherein the light-affecting material is arranged to receive emissions from the lighting device having a first gamut property, interact with the received emissions to produce gamut-altered emissions having a second gamut property that differs from the first gamut property, and transmit the gamut-altered emissions to exit the retrofit element. In certain embodiments, such different gamut properties may include GAI values differing by at least 10%, by at least 15%, or another threshold disclosed herein, and/or Q_gvalues differing by at least 5%, by at least 10%, by at least 15%, or another threshold disclosed herein

0070Propagation of emission portions having different gamut properties in different directions, and/or illumination of different light output surfaces or areas of a lighting device, enables different illumination of different elements and/or surfaces in an environment using a single lighting device. For example, it may be desirable in a retail setting or office setting to cause objects displayed on tabletops to have vivid color (e.g., with high gamut) in order to increase their attractiveness, but it may not be desirable to illuminate walls in a similar manner since wall surfaces may attain an unnatural tint. Numerous other settings may benefit from the ability to direct light with higher GAI and Q_gvalues in one direction and to direct light with lower GAI and Q_gin another direction using a single lighting device.

0071In certain embodiments, emitters having different gamut properties may be arranged on different (e.g., non-coplanar) support surfaces and aimed or oriented in different directions to cause beams or emission portions having different gamut properties to be cast in different directions when exiting a lighting device. In certain embodiments, different gamut properties may be obtained by adding notch filtering material to one or more emitters. In certain embodiments, different gamut properties may be obtained by adding different lumiphoric materials (e.g., phosphors) to different emitters. For example, a blue-shifted green emitter (e.g., blue LED arranged to stimulate a lumiphor having a dominant wavelength in the green range) may exhibit an increased gamut property relative to a blue emitter (e.g., blue LED) or blue-shifted yellow emitter (e.g., blue LED arranged to stimulate a lumiphor having a dominant wavelength in the yellow range). Other methods may be used to provide electrically activated emitters having different gamut properties in a single lighting device.

0072In certain embodiments, a lighting device includes at least one first electrically activated light emitter (e.g., arranged to illuminate a first light emitting region of the lighting device) and at least one second electrically activated light emitter (e.g., arranged to illuminate a second light emitting region of the lighting device), wherein the at least one first electrically activated light emitter is arranged to produce spectral output having a GAI (or Q_g) value that exceeds a corresponding GAI (or Q_g) value of spectral output produced by the at least one second electrically activated light emitter. In certain embodiments, at least one first electrically activated light emitter may be independently controllable relative to the at least one second electrically activated light emitter. In certain embodiments, one or more electrically activated light emitters may include one or more solid state light emitters, which may include one or more lumiphoric materials arranged to be stimulated by one or more solid state light emitters. In certain embodiments, multiple lumiphoric materials have different dominant wavelengths (e.g., first and second dominant wavelengths) may be provided.

0073In certain embodiments, emitters having different gamut properties may be arranged on a single planar support surface or multiple coplanar support surfaces, and one or more optical elements, light blocking elements, and/or light-affecting-elements may be used to cause beams or emission portions having different gamut properties to be cast in different directions when exiting a lighting device.

0074In certain embodiments, light reflective elements or light reflective regions having different light-affecting properties (including gamut-affecting properties) may be arranged to receive emissions of a single emitter (or multiple emitters having the same gamut properties), and cause beams or emission portions having different gamut properties to be cast in different directions when exiting a lighting device.

0075In certain embodiments, light-transmissive elements or light-transmissive regions having different light-affecting properties (including gamut-affecting properties) may be arranged to receive emissions of a single emitter (or multiple emitters having the same gamut properties), and cause beams or emission portions having different gamut properties to be cast in different directions when exiting a lighting device.

0076In certain embodiments, emitters of a lighting device having different gamut properties may be supported on individual support elements that may be adjustable (e.g., manually deformable) to permit a manufacturer or user to adjust directionality (e.g., including overlap or lack of overlap) of different beams or emission portions having different gamut properties to be cast in different directions when exiting a lighting device.

0077In certain embodiments, one or more light-affecting elements may be provided in combination with a single emitter or with multiple emitters having the same gamut properties, whereby a portion of light emissions are arranged to interact with a first light-affecting element, and another portion of light emissions are either (i) transmitted through a second light-affecting element differing from the first light-affecting element or (ii) not transmitted through any light-affecting element, to cause beams or emission portions having different gamut properties to be cast in different directions when exiting a lighting device.

0078In certain embodiments, one or more emitters having the same gamut properties may be arranged for direct transmission of light, whereby emissions of the one or more emitters is directly impinged on one or more light-affecting elements, and beams or emission portions having different gamut properties are cast in different directions when exiting a lighting device.

0079In certain embodiments, one or more emitters having the same gamut properties may be arranged for indirect transmission of light, whereby emissions of the one or more emitters is indirectly impinged (e.g., following reflection) on one or more light-affecting elements, and beams or emission portions having different gamut properties are cast in different directions when exiting a lighting device.

0080In certain embodiments, a lighting device may include one or more emitters arranged for direct transmission of light and one or more emitters arranged for indirect transmission of light (e.g., involving impingement of light on at least one reflector), whereby any of (i) at least a portion of the directly transmitted emissions and (ii) at least a portion of the indirectly transmitted emissions are impinged on one or more light-affecting elements, and beams or emission portions having different gamut properties are cast in different directions when exiting the lighting device.

0081In certain embodiments, a light-affecting element may comprise light-affecting material arranged in or on an electrically activated light emitter. In certain embodiments, a light-affecting element may comprise at least one light-affecting material arranged in or on a substantially light-transmissive surface or element. In certain embodiments, a light-affecting element may comprise at least one light-affecting material arranged in or on a substantially light-reflective surface or element. In certain embodiments, a light-affecting element may comprise at least one light-affecting material arranged in or on a light-diffusing surface or element.

0082In certain embodiments, presence, amount, and/or patterning of one or more light-affecting materials in different areas of a lighting device may be adjusted to provide desired light-affecting characteristics in order to cause beams or emission portions having different gamut properties to be cast in different directions when exiting the lighting device. In certain embodiments, multiple light-affecting materials (e.g., filters, pigments, and lumiphors) having different gamut properties may be provided in a single lighting device.

0083In certain embodiments, at least one transition region may be arranged between light emission regions, light output surfaces, or light output areas having different gamut properties. In certain embodiments, at least one transition region may include at least one stepped transition. In certain embodiments, at least one transition region may include at least one gradient transition. In certain embodiments, at least one transition region may include a feathered or sawtooth transition.

0084In certain embodiments, a lighting device may be arranged to provide at least one beam or emission portion with a higher GAI or Q_gvalues in a central (e.g., substantially vertical) light emission direction, and to provide at least one beam or emission portion with a lower GAI or Q_gvalues in a peripheral (e.g., substantially horizontal) light emission direction. In alternative embodiments, a lighting device may be arranged to provide at least one beam or emission portion with a higher GAI or Q_gvalues in a peripheral (e.g., substantially horizontal) light emission direction, and to provide at least one beam or emission portion with a lower GAI or Q_gvalues in a central (e.g., substantially vertical) light emission direction.

0085Unless otherwise defined, terms used herein should be construed to have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. It will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art, and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

0086It will be understood that although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.

0087Embodiments of the present disclosure are described herein with reference to cross-sectional, perspective, elevation, and/or plan view illustrations that are schematic illustrations of idealized embodiments of the present disclosure. Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances are to be expected, such that embodiments of the present disclosure should not be construed as limited to particular shapes illustrated herein. The present disclosure may be embodied in different forms and should not be construed as limited to the specific embodiments set forth herein. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. In certain drawings, conventional features inherent to LED devices known in the art but not essential to the understanding of the present disclosure have been omitted to facilitate ease of explanation of the inventive subject matter.

0088Unless the absence of one or more elements is specifically recited, the terms “comprising”, “including”, and “having”, as used herein, should be interpreted as open-ended terms that do not preclude the presence of one or more elements.

0089It will be understood that when an element such as a layer, region, or substrate is referred to as being “on” another element, it can be directly on the other element or intervening elements may be present. Moreover, relative terms such as “on”, “above”, “upper”, “top”, “lower”, or “bottom” may be used herein to describe a relationship between one structure or portion to another structure or portion as illustrated in the figures, but it should be understood that such relative terms are intended to encompass different orientations of the device in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, structure or portion described as “above” other structures or portions would now be oriented “below” the other structures or portions.

0090Various types of electrically activated light emitters (e.g., solid state, incandescent, fluorescent, high intensity discharge, and the like) may be used with certain embodiments disclosed herein. Although various embodiments and examples described herein make particular reference to solid state light emitters, the scope of this disclosure is not so limited. In certain embodiments, one or more electrically activated emitters may include solid state emitters such as (but not limited to) light-emitting diodes. In certain embodiments, one or more electrically activated emitters may be arranged to stimulate emissions of one or more lumiphoric materials. In certain embodiments, lighting devices herein may include multiple lumiphor-converted electrically activated solid state light emitters. In certain embodiments, multiple different electrically activated solid state light emitters may be provided wherein one is arranged to stimulate lumiphor emissions, but may be devoid of any non-lumiphor converted blue solid state emitter (i.e., a solid state emitter having a dominant wavelength in a range of from 430 nm to 480 nm that is not arranged to stimulate emissions of a lumiphoric material).

0091The terms “electrically activated emitter” and “emitter” as used herein refer to any device capable of producing visible or near visible (e.g., from infrared to ultraviolet) wavelength radiation, including but not limited to, xenon lamps, mercury lamps, sodium lamps, incandescent lamps, and solid state emitters (including LEDs), organic light-emitting diodes (OLEDs), and lasers.

0092The terms “solid state light emitter” or “solid state emitter” represent a subset of electrically activated emitters, and may include a light emitting diode, laser diode, organic light emitting diode, and/or other semiconductor device which includes one or more semiconductor layers (e.g., silicon, silicon carbide, gallium nitride, etc.), a substrate (e.g., sapphire, silicon, silicon carbide, etc.), and one or more contact layers.

0093Solid state light-emitting devices according to embodiments of the present disclosure may include, but are not limited to, III-V nitride based LED chips or laser chips fabricated on a silicon, silicon carbide, sapphire, or III-V nitride growth substrate, including (for example) devices manufactured and sold by Cree, Inc. of Durham, N.C. Such LEDs and/or lasers may optionally be configured to operate such that light emission occurs through the substrate in a so-called “flip chip” orientation. Such LED and/or laser chips may also be devoid of growth substrates (e.g., following growth substrate removal).

0094LED chips useable with lighting devices as disclosed herein may include horizontal devices (with both electrical contacts on a same side of the LED) and/or vertical devices (with electrical contacts on opposite sides of the LED). A horizontal device (with or without the growth substrate), for example, may be flip-chip bonded (e.g., using solder) to a carrier substrate or PCB, or wire bonded. A vertical device (without or without the growth substrate) may have a first terminal solder bonded to a carrier substrate, mounting pad, or printed circuit board (PCB), and have a second terminal wire bonded to the carrier substrate, electrical element, or PCB. Any combination of one or more of the following LED configurations may be used in a solid state lighting device disclosed herein: horizontal LED chips, horizontal flip LED chips, vertical LED chips, vertical flip LED chips, and/or combinations thereof, with conventional or reverse polarity.

0095Solid state light emitters may be used individually or in groups to emit one or more beams to stimulate emissions of one or more lumiphoric materials (e.g., phosphors, scintillators, lumiphoric inks, quantum dots, day glow tapes, etc.) to generate light at one or more peak wavelength(s), or of at least one desired perceived color (including combinations of colors that may be perceived as white). Lumiphoric materials may be provided in the form of particles, films, or sheets.

0096In certain embodiments, lumiphoric materials may be used as light-affecting elements to cause beams or emission portions having different gamut properties to be cast in different directions when exiting a lighting device. In certain embodiments, lumiphoric materials may be present in a lighting device without being used as light-affecting elements to cause beams or emission portions having different gamut properties to be cast in different directions when exiting a lighting device

0097Inclusion of lumiphoric (also called “luminescent”) materials in lighting devices as described herein may be accomplished by any suitable means, including: direct coating on electrically activated emitters; dispersal in encapsulant materials arranged to cover electrically activated state emitters; coating on lumiphor support elements (e.g., by powder coating, inkjet printing, or the like); and incorporation into diffusers or lenses and the like. Examples of lumiphoric materials are disclosed, for example, in U.S. Pat. No. 6,600,175; U.S. Patent Application Publication No. 2009/0184616; and U.S. Patent Application Publication No. 2012/0306355, and methods for coating light-emitting elements with phosphors are disclosed in U.S. Patent Application Publication No. 2008/0179611, with the foregoing publications being incorporated by reference. Other materials, such as light scattering elements (e.g., particles) and/or index matching materials, may be associated with a lumiphoric material-containing element or surface. One or more lumiphoric materials useable in devices as described herein may be down-converting or up-converting, or can include a combination of both types.

0098In certain embodiments, at least one lumiphoric material may be spatially segregated (i.e., “remote”) from and arranged to receive emissions from at least one electrically activated emitter, with such spatial separation reducing thermal coupling between an electrically activated emitter and lumiphoric material. In certain embodiments, a spatially segregated lumiphor may be arranged to fully cover one or more electrically activated emitters of a lighting device. In certain embodiments, a spatially segregated lumiphor may be arranged to cover only a portion or subset of one or more electrically activated emitters.

0099In certain embodiments, at least one lumiphoric material may be arranged with a substantially constant thickness and/or concentration relative to different electrically activated emitters. In certain embodiments, one or more lumiphoric materials may be arranged with presence, thickness, and/or concentration that vary relative to different emitters. Multiple lumiphors (e.g., lumiphors of different compositions) may be applied with different concentrations or thicknesses relative to different electrically activated emitters. In one embodiment, lumiphor presence, composition, thickness, and/or concentration may vary relative to multiple electrically activated emitters. In certain embodiments, at least one lumiphoric material may be applied to an electrically activated emitter or a lumiphoric material support surface by patterning, such may be aided by one or more masks.

0100Various substrates may be used as mounting elements on which, in which, or over which multiple electrically activated light emitters (e.g., solid state emitter chips) may be arranged, supported, or otherwise mounted. Exemplary substrates include printed circuit boards (including, but not limited to, metal core printed circuit boards, flexible circuit boards, dielectric laminates, and the like) having electrical traces arranged on one or multiple surfaces thereof. A substrate, mounting plate, or other support element may include a PCB, a metal core printed circuit board (MCPCB), a flexible printed circuit board, a dielectric laminate (e.g., FR-4 boards as known in the art), or any suitable substrate for mounting LED chips or packages. In certain embodiments, at least a portion of a substrate may include a dielectric material to provide desired electrical isolation between electrical traces or components of multiple emitter sets. In certain embodiments, a substrate can comprise ceramics such as alumina, aluminum nitride, silicon carbide, or a polymeric material such as polyimide, polyester, etc. In certain embodiments, a substrate may comprise a flexible circuit board or a circuit board with plastically deformable portions to allow the substrate to take a non-planar (e.g., bent) or curved shape allowing for directional light emission with electrically activated emitters (e.g., LED chips) also being arranged in a non-planar manner.

0101In certain embodiments, a lighting device can include one or more “chip-on-board” (COB) LED chips and/or packaged LED chips that can be electrically coupled or connected in series or parallel with one another and mounted on a portion of a substrate. In certain embodiments, COB LED chips can be mounted directly on portions of a substrate without the need for additional packaging.

0102Certain embodiments may involve use of solid state emitter packages. A solid state emitter package may include at least one solid state emitter chip (more preferably multiple solid state emitter chips) that is enclosed with packaging elements to provide environmental protection, mechanical protection, color selection, and/or light focusing utility, as well as electrical leads, contacts, and/or traces enabling electrical connection to an external circuit. One or more emitter chips may be arranged to stimulate one or more lumiphoric materials, which may be coated on, arranged over, or otherwise disposed in light receiving relationship to one or more solid state emitters. At least one lumiphoric material may be arranged to receive emissions of at least some emitters of a plurality of solid state light emitters and responsively emit lumiphor emissions. A lens and/or encapsulant material, optionally including lumiphoric material, may be disposed over solid state emitters, lumiphoric materials, and/or lumiphor-containing layers in a solid state emitter package.

0103In certain embodiments, a light-emitting apparatus as disclosed herein (whether or not including one or more LED packages) may include at least one of the following items arranged to receive light from multiple LEDs: a single leadframe arranged to conduct electrical power to the plurality of electrically activated solid state light emitters; a single reflector arranged to reflect at least a portion of light emanating from the plurality of electrically activated solid state light emitters; a single submount or mounting element supporting the plurality of electrically activated solid state light emitters; a single lens arranged to transmit at least a portion of light emanating from the plurality of electrically activated solid state light emitters; and a single diffuser arranged to diffuse at least a portion of light emanating from the plurality of electrically activated solid state light emitters. In certain embodiments, a light-emitting apparatus including multiple LEDs may include at least one of the following items arranged to receive light from multiple LEDs: multiple lenses; multiple optical elements; and multiple reflectors. Examples of optical elements include, but are not limited to, elements arranged to affect light mixing, focusing, collimation, dispersion, and/or beam shaping.

0104In certain embodiments, a package including multiple solid state emitters may include multiple die attach pads, with a single die attach pad supporting each separately controllable solid state emitter or each separately controllable group of solid state emitters. A package including multiple solid state emitters may include a single lens (e.g., a molded lens) arranged to transmit at least a portion of light emanating from each solid state emitter. In certain embodiments, a molded lens may be arranged in direct contact with LED chips, die attach pads, other electrical elements, and/or exposed insulating material along a top surface of a substrate comprising insulating material. In certain embodiments, a lens may be textured or faceted to improve light extraction, and/or a lens may contain or have coated thereon various materials such as lumiphors and/or scattering particles. In certain embodiments, a package may include a molded lens arranged to transmit light emitted by multiple LEDs. A molded lens may be formed of liquid curable silicone in which LED chips may be embedded. Alternatively, a lens may be pre-molded and then affixed (e.g., with adhesives, thermal bonding, or any other suitable joining method) to a subassembly including a substrate to which at least one LED chip is mounted.

0105The expressions “lighting device”, “light-emitting device”, and “light-emitting apparatus” as used herein are not limited, except that such elements are capable of emitting light. That is, a lighting device or light-emitting apparatus can be a device which illuminates an area or volume (e.g., a structure, a swimming pool or spa), a room, a warehouse, an indicator, a road, a parking lot, a vehicle, signage (e.g., road signs), a billboard, a ship, a toy, a mirror, a vessel, an electronic device, a boat, an aircraft, a stadium, a computer, a remote audio device, a remote video device, a cell phone, a tree, a window, an LCD display, a cave, a tunnel, a yard, a lamppost, or a device or array of devices that illuminate an enclosure, or a device that is used for edge or back-lighting (e.g., backlight poster, signage, LCD displays), light bulbs, bulb replacements (e.g., for replacing AC incandescent lights, low voltage lights, fluorescent lights, etc.), outdoor lighting, street lighting, security lighting, exterior residential lighting (e.g., wall mounts, post/column mounts), ceiling fixtures/wall sconces, under cabinet lighting, lamps (e.g., floor and/or table and/or desk), landscape lighting, track lighting, task lighting, specialty lighting, ceiling fan lighting, archival/art display lighting, high vibration/impact lighting (e.g., work lights etc.), mirrors/vanity lighting, or any other light-emitting devices. An illuminated area may include at least one of the foregoing items. In certain embodiments, lighting devices or light-emitting apparatuses as disclosed herein may be self-ballasted. In certain embodiments, a lighting device may be embodied in a light fixture.

0106In certain embodiments, a lighting device as disclosed herein (such as a solid state lighting device) may be devoid of any incandescent light-emitting element. In certain embodiments, a solid state lighting device as disclosed herein may lack any “unconverted” blue-emitting solid state emitter not arranged to stimulate emissions of a lumiphoric material.

0107Methods include illuminating an object, a space, or an environment utilizing one or more lighting devices or light-emitting apparatuses as disclosed herein. In certain embodiments, a lighting apparatus as disclosed herein may include multiple light-emitting elements (e.g., LEDs) arranged in at least one array (e.g., one or more two-dimensional arrays).

0108In certain embodiments, at least one control circuit may be arranged to adjust operation of one or more light emitters to move between at least two operating states of a lighting device in order to establish or alter directional variation in gamut properties of emissions of the lighting device. In certain embodiments, such adjustment of operation may be responsive to a user input element and/or a sensor.

0109In certain embodiments, at least one beam or emission portion (optionally, all beams or emission portions) exiting a lighting device as disclosed herein may be on or proximate to the blackbody locus or the white body line. In certain embodiments, at least one color point may include a desired color rendering value (e.g., CRI Ra of at least 50, at least 80, or another value disclosed herein). In certain embodiments, at least one color point may include a GAI value in a range of from 80 to 100, optionally in combination with a CRI Ra value of at least 80. In certain embodiments, first and second color points may preferably be in a desirable range of from 2,500K to 5,000K, from 2,700K to 4,000K, or some other range described herein. In certain embodiments, at least one operating state may be arranged to provide a luminous efficacy of at least 60 lumens per watt, and/or a luminous flux of at least 500 lumens.

0110In certain embodiments, lighting devices as disclosed herein may utilize a light-affecting element including a notch filtering material arranged to at least partially inhibit transmission of selected wavelengths of light. Such a filtering material may be used to affect (e.g., increase) GAI/Q_g, and/or CRI Ra. The term “notch filtering material” refers to a material that affects passage of light to cause light exiting the material to exhibit a spectral notch. A spectral notch is a portion of the color spectrum where the light is attenuated, thus forming a “notch” when light intensity is plotted against wavelength. Examples of notch filtering materials include rare earth and lanthanide materials such as lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, and yttrium, as well as oxides thereof (e.g., neodymium oxide). Different rare earth compounds may exhibit notch filtering characteristics of different wavelength ranges. For example, neodymium (or oxide thereof) when used as a filtering material may produce a spectral notch in the yellow range, whereas erbium (or oxide thereof) when used as a filtering material may produce a spectral notch in the cyan range. Additional notch filtering materials include color pigments. As with the use of rare earth compounds, the use of color pigments can impart notch filtering properties in either transmissive or reflective applications. In many instances, color pigments may provide softer spectral notch (with more gradually sloping wavelength attenuation) characteristics relative to other notch filtering materials. One example of a color pigment includes an ultramarine pigment based on CoAl₂O₄, providing peak attenuation at a wavelength of about 580 nm. A cobalt blue pigment of similar composition could also be used. Other color pigments based on CuSO₄or NiCl₂can also be used. A variety of natural and synthetic pigments are available and could be used as notch filtering materials according to certain embodiments disclosed herein. Notch filters may also be fabricated by depositing one or more dielectric layers (e.g., to form dielectric stacks) on substrates, such as filters commercially available from Thorlabs, Inc. of Newton, N.J. US, having the following center wavelengths (CWL) and full width at half maximum (FWHM) characteristics: CWL=488 nm, FWHM=15 nm; CWL=514 nm, FWHM=17 nm; CWL=533 nm, FWHM=17 nm; CWL=561 nm, FWHM=18 nm; CWL=594 nm, FWHM=23 nm; 633 nm, FWHM=25 nm; and CWL=658 nm, FWHM=26 nm.

0111In certain embodiments, at least one notch filtering material may be arranged to receive at least a portion of emissions generated by at least one electrically activated light emitter of a lighting device and filter the received emissions to exhibit a spectral notch (e.g., after being affected by the notch filtering material).

0112In certain embodiments utilizing one or more notch filtering materials, a spectral notch provided by at least one filtering material may have a full width in a range of less than or equal to 40 nm, or less than or equal to 35 nm, or less than or equal to 30 nm, or less than or equal to 25 nm, or less than or equal to 20 nm, in each case corresponding to a half maximum relative reduction in light transmission. In certain embodiments utilizing one or more notch filtering materials, at least one filtering material may be arranged to filter light within (or overlapping) the yellow-green range or yellow range, such as to provide peak attenuation in a range of from 550 nm to 590 nm, or from 570 nm to 590 nm.

0113In embodiments utilizing notch filtering materials, such materials may be provided as microparticles or nanoparticles of any desired size, size distribution, and geometric shape. In certain embodiments, multiple notch filtering materials may be mixed and incorporated in a carrier material or binder, or multiple notch filtering materials may otherwise be used in combination (e.g., in sequential layers, with or without a binding medium) to provide multiple spectral notches. In certain embodiments, notch filtering materials may be arranged in or on an at least partially light-transmissive optical element or enclosure, which may serve as a lens and/or diffuser. Examples of desirable materials for carriers, binding media, enclosures, and/or optical elements include, but are not limited to silicone, resin, epoxy, thermoplastic polycondensate, polymeric materials, and glass. In certain embodiments, such materials may be molded and/or cured together with at least one notch filtering material. In certain embodiments, a lighting device may include one or more transmissive optical elements and/or reflective optical elements incorporating at least one notch filtering material. For example, a so-called “troffer” style ceiling fixture may include a reflector that serves as an optical element, and may additionally include optical elements such as glass plates or lenses.

0114In certain embodiments utilizing notch filtering materials, at least one notch filtering material may be arranged with a substantially constant thickness and/or concentration relative to different electrically activated emitters (e.g., solid state emitters such as LEDs), one or more light-transmitting elements or regions thereof, and/or one or more light-reflecting elements or regions thereof. In certain embodiments, one or more filtering materials may be arranged on or over at least one solid state emitter (optionally with an intervening lumiphoric material), at least one light-transmitting element, or at least one light-reflecting element, with presence, composition, amount, thickness, concentration and/or patterning that vary relative to different emitters, relative to different light-transmitting elements or portions thereof, and/or relative to different light-reflecting elements or portions thereof. Multiple filtering materials (e.g., filtering materials of different compositions arranged to provide spectral notches at different wavelengths) may be applied to one or more electrically activated emitters, light-transmitting element, and/or light-reflecting elements. In certain embodiments, at least one filtering material may be applied over one or more solid state light emitters, light-transmitting elements, light-reflecting elements, or other support surface(s) utilizing a patterning technique, such may be aided by one or more masks. In certain embodiments, one or more notch filtering materials may be integrated with, or arranged in contact with, one or more portions of an emitter package, a light bulb, or a light fixture.

0115In certain embodiments utilizing notch filtering materials, one or more notch filtering materials may be mixed with one or more other functional materials (e.g., lumiphoric materials, scattering materials, and the like) and preferably incorporated into a binder or other carrier medium. In certain embodiments, at least one filtering material may be arranged in or on a carrier arranged to receive light from one or more electrically activated emitters.

0116In certain embodiments utilizing notch filtering materials, notch filtering materials may be arranged in or on a reflector, which may be either specularly reflective or diffusively reflective. Any suitable reflective material in the art may be used, including, but not limited to MCPET (microcellular foamed white polyethylene terephthalate), and surfaces metalized with one or more metals such as, but not limited to silver (e.g., a silvered surface). A preferred light-reflective material would be at least about 90% reflective, more preferably at least about 95% reflective, and still more preferably at least about 98-99% reflective of light of a desired wavelength range, such as one or more of visible light, ultraviolet light, and/or infrared light, or subsets thereof. In certain embodiments, at least one notch filtering material may be deposited on a surface of a reflector by spray coating, spin coating, sputtering, dipping, rolling, electrostatic deposition, or electrophoretic deposition. In certain embodiments, at least one notch filtering may be incorporated into a surface of a reflector via methods such as molding or sintering.

0117In certain embodiments utilizing notch filtering materials, one or more notch filtering materials may be coated or otherwise arranged on, over, or against at least one surface of one or more electrically activated emitters (e.g., solid state emitter chips). In certain embodiments, one or more notch filtering materials may be coated or otherwise arranged on, over, or against at least one surface of at least one lumiphoric material, wherein the at least one lumiphoric material may be arranged in direct contact with at least one surface of an electrically activated emitter (e.g., solid state emitter chip), or may be arranged remotely from (i.e., spatially segregated from) at least one surface of an electrically activated emitter. In certain embodiments, one or more notch filtering materials may be conformally coated on the surface of at least one electrically activated emitter (e.g., solid state emitter chip) and/or lumiphoric material, wherein conformal coating in this regard refers to a coating that follows the shape and contour of at least one surface (or preferably multiple surfaces) of an emitter (e.g., chip) with a substantially uniform thickness.

0118Parameters such as the type or composition of carrier or binding medium; the thickness, concentration, particle size, and particle size distribution of notch filtering material(s); and the presence, amount, and type of other trace substances accompanying one or more notch filtering elements, may be adjusted to provide one or more spectral notches of desired width and/or depth.

0119As noted previously, a color point of one or more (optionally, all) different beams, different emission portions, or different mixtures of light having different gamut properties of a lighting device may be on or proximate to (e.g., within 7 MacAdam ellipses, within 5 MacAdam ellipses, within 4 MacAdam ellipses, or within 2 MacAdam ellipses of) the blackbody locus (or the Planckian locus) in certain embodiments. In certain embodiments, a color point of one or more (optionally, all) different beams, different emission portions, or different mixtures of light having different gamut properties of a lighting device may be on or proximate to (e.g., 7 MacAdam ellipses, within 5 MacAdam ellipses, within 4 MacAdam ellipses, or within 2 MacAdam ellipses of) the white body line (a/k/a, the white body locus or line of minimum tint). The white body line may be approximated by a line including segments defined by the following x, y coordinates on a 1931 CIE Chromaticity Diagram: (0.3114, 0.3386) to (0.3462, 0.3631), (0.3462, 0.3631) to (0.3777, 0.3790), (0.3777, 0.3790) to (0.3977, 0.3707), (0.3977, 0.3707) to (0.4211, 0.3713), and (0.4211, 0.3713) to (0.4437, 0.3808). Any of the foregoing color points may be in one or more of the following CCT ranges: from 2,500K to 10,000K, from 2,500 to 4,000K, from 2,500K to 4,000K, from 2,500K to 3,500K, from 2,500K to 3,000K, from 2,700K to 5,000K, from 2,700K to 4,100K, from 2,700K to 4,000K, from 4,100K to 10,000K, from 4,100K to 8,000K, and from 4,100K to 6,500K.

0120In certain embodiments, one or more (optionally, all) different beams, different emission portions, or different mixtures of light having different gamut properties may have a luminous efficacy in at least one of the following lumens per watt ranges: at least 60, at least 80, at least 100, at least 120, or at least 140. In certain embodiments, one or more (optionally, all) different beams, different emission portions, or different mixtures of light having different gamut properties have a GAI (or Q_g) value of at least 50 and a CRI Ra value of at least 50, with the foregoing ranges optionally being bounded by 70, 80, 90, or 100 at the upper end. In certain embodiments, one or more (optionally, all) different beams, different emission portions, or different mixtures of light having different gamut properties have a GAI (or Q_g) value in a range of from 80 to 100 in conjunction with a CRI Ra value of at least 80, optionally bounded at the upper end by a CRI RA value of 90, 92, 94, or 96.

0121In certain embodiments, a lighting device may include one or more light-affecting materials arranged to alter gamut properties of light emitted by one or more electrically activated emitters and/or lumiphoric materials of a lighting device. Examples of light-affecting materials that may affect gamut properties include, but are not limited to, filters (such as notch filters), pigments, lumiphors, and the like. In certain embodiments, light-affecting materials may be arranged in, arranged on, or otherwise applied to electrically activated emitters, substantially light-transmissive elements, and/or substantially light reflective elements. In certain embodiments, presence, concentration, amount, and/or patterning of one or more light-affecting materials may be used to adjust light-affecting (e.g., gamut-altering) characteristics.

0122In certain embodiments, at least one of the first light-emitting region and the second light-emitting region may include at least one light-affecting material arranged to alter (e.g., increase) gamut characteristics (e.g., GAI and/or Q_gvalues), and at least one of presence, composition, amount, concentration, thickness, and patterning of at least one light-affecting material may differ among a first light-emitting surface or region and a second light-emitting surface or region. In certain embodiments, a first light-emitting region or surface may include light-affecting material, and a second light-emitting region or surface may be devoid of light-affecting material. In certain embodiments, at least one light-affecting material may be arranged in or on at least a portion of a substantially light-transmissive element. In certain embodiments, at least one light-affecting material may be arranged in or on at least a portion of a substantially light reflective element. In certain embodiments, a light-transmissive element may include an interior surface and an exterior surface that are both arranged in fluid communication with (e.g., to receive air from) an ambient environment. In certain embodiments, at least one light-affecting material may include one or more notch filtering materials, one or more lumiphoric materials, and/or one or more color pigments. In certain embodiments, a first light-emitting region includes a first lumiphoric material, and a second light-emitting region comprises a second lumiphoric material that comprises a different dominant wavelength than the first lumiphoric material (e.g., differing in dominant wavelength by a value of at least 20 nm, at least 30 nm, at least 50 nm, or another desired threshold).

0123In certain embodiments, a lighting device may include multiple electrically activated light emitters having different gamut properties (e.g., GAI values differing by at least 10%, by at least 15%, or another threshold disclosed herein, or Q_gvalues differing by at least 5%, by at least 10%, by at least 15%, or another threshold disclosed herein), wherein emitters or groups of emitters with different gamut properties are arranged to illuminate different regions of a light output surface or area of the lighting device. In certain embodiments, at least one first electrically activated light emitter is independently controllable relative to at least one second electrically activated light emitter. In certain embodiments, a lighting device may include a user input element or sensor wherein any of (i) at least one first electrically activated light emitter and (ii) at least one second electrically activated light emitter is operated responsive to an output signal of the user input element or sensor.

0124In certain embodiments, a first emitter or emitter group (e.g., arranged to produce a first mixture of light including a first color point) and a second emitter or emitter group (e.g., arranged to produce a second mixture of light including a second color point) may be separately arranged to produce white light with different gamut areas and/or relative gamut values, and the different mixtures of light may be transmitted or reflected in different directions. In certain embodiments, a difference in direction between first and second mixtures of light may meet one or more of the following thresholds: at least about 15 degrees, at least about 25 degrees, at least about 35 degrees, at least about 45 degrees, at least about 55 degrees, at least about 65 degrees, at least about 75 degrees, and at least about 90 degrees.

0125In certain embodiments, a first electrically activated emitter or electrically activated emitter group may include at least one first solid state emitter, and a second electrically activated emitter or emitter group may include at least one second solid state emitter. Either emitter/emitter group or both emitters/emitter groups may include one or more solid state emitters arranged to stimulate emissions of at least one lumiphoric material.

0126In certain embodiments, a lighting device may include multiple light-emitting regions to transmit or reflect emission portions having different gamut properties (e.g., GAI values differing by at least 10%, by at least 15%, or another threshold disclosed herein, or Q_gvalues differing by at least 5%, by at least 10%, by at least 15%, or another threshold disclosed herein). In certain embodiments, different light-emitting regions may be arranged to transmit emission portions or light beams having different GAI or Q_gvalues in different directions (e.g., a predominantly vertical direction and a predominantly horizontal direction, or another combination of directions), such as may include a first beam or group of beams centered in a first direction, and a second beam or group of beams centered in a second direction. In certain embodiments, a difference in direction between first and second beams or groups of beams may meet one or more of the following thresholds: at least about 15 degrees, at least about 25 degrees, at least about 35 degrees, at least about 45 degrees, at least about 55 degrees, at least about 65 degrees, at least about 75 degrees, and at least about 90 degrees.

0127In certain embodiments, a first light-emitting region or area of a lighting device may include a first gamut property (e.g., a first GAI and/or Q_gvalue), a second light-emitting region or area of a lighting device may include a second gamut property (e.g., a second GAI and/or Q_gvalue) that differs from the first gamut property, and at least one intermediate region arranged between the first light-emitting region or area, wherein the at least one intermediate region is arranged to provide emissions having a third gamut property (e.g., a third GAI and/or Q_gvalue) that is between the first gamut property and the second gamut property.

0128In certain embodiments, at least one transition region may be arranged between a first light-emitting region or area (having a first GAI and/or Q_gvalue) and a second light-emitting region or area (having a second GAI and/or Q_gvalue) of a lighting device, wherein the at least one transition region is arranged to provide a gradient (e.g., gradual) transition of gamut properties (e.g., including at least one GAI and/or Q_gvalue between the first and the second GAI and/or Q_gvalues). In certain embodiments, a transition region may include a stepwise transition of gamut properties including one or more sharp steps in GAI and/or Q_gvalue. In certain embodiments, a transition region may include a sawtooth or feathered boundary of gamut properties between first and second regions. Provision of a transition region between a first and a second light-emitting region or area may reduce perceptibility of a boundary between first and second light-emitting regions or areas of a lighting device, and/or may reduce perceptibility of illumination differences between different surfaces or areas illuminated by first and second light-emitting regions or areas of a lighting device.

0129In certain embodiments, one or more light-affecting materials as disclosed herein may be arranged in or on a lens, diffuser, or globe that serves as an outermost light-transmissive surface of a lighting device. In certain embodiments, one or more light-affecting materials as disclosed herein may be arranged within an interior portion or cavity of a lighting device that is bounded by a lens, diffuser, or globe, wherein the one or more light-affecting materials are not arranged in contact with the lens, diffuser, or globe. In certain embodiments, one or more light-affecting materials as disclosed herein may be arranged outside an interior portion or cavity of a lighting device that is bounded by a lens, diffuser, or globe, wherein the one or more light-affecting materials are not arranged in contact with the lens, diffuser, or globe.

0130In certain embodiments, a lighting device may include at least one first electrically activated light emitter arranged to produce, in the absence of any additional light, emissions having a first GAI value; and at least one second electrically activated light emitter arranged to produce, in the absence of any additional light, emissions having a second GAI value, wherein the second GAI value differs from the first GAI value by at least 10%; wherein the at least one first electrically activated emitter is arranged to illuminate a first region of a light output surface or area of the lighting device; and wherein the at least one second electrically activated emitter is arranged to illuminate a second region of a light output surface or area of the lighting device. In certain aspects, the preceding GAI threshold may be replaced with one or more Q_gvalues or other GAI values as disclosed herein. In certain embodiments, the first region may be arranged to transmit or reflect at least a portion of emissions of the at least one first electrically activated light emitter in a vertical direction, and the second region may be arranged to transmit or reflect at least a portion of emissions of the at least one second electrically activated light emitter in a lateral direction. In certain embodiments, a notch filtering material may be arranged to receive at least a portion of emissions generated by the at least one first electrically activated light emitter and filter the received emissions to exhibit a spectral notch (e.g., after being affected by the notch filtering material). In certain embodiments, one or more of the at least one first electrically activated light emitter and the at least one second electrically activated light emitter may comprise at least one electrically activated solid state light emitter and/or at least one lumiphoric material may be arranged to be stimulated by at least one electrically activated (e.g., solid state) light emitter. In certain embodiments, the at least one first electrically activated light emitter may be independently controllable relative to the at least one second electrically activated light emitter. In certain embodiments, at least one of the first region and the second region may include at least one light-affecting material as disclosed herein arranged to increase GAI, and at least one of presence, composition, concentration, amount, thickness, and patterning of at least one light-affecting material may differ among the first region and the second region. In certain embodiments, the at least one light-affecting material may include a filtering material, a lumiphoric material, a color pigment material, or other material arranged to alter gamut properties of light upon interaction with the light-affecting material. In certain embodiments, at least one intermediate or transition region as disclosed herein may be provided between first and second regions.

0131In certain embodiments, a retrofit element for a lighting device may include an attachment structure arranged for removable attachment to the lighting device, and a light-affecting material supported by the attachment structure and arranged to span across a portion of a light output surface or area of the lighting device, wherein the light-affecting material is arranged to receive emissions from the lighting device having a first GAI value, interact with the received emissions to produce gamut-altered emissions having a second GAI value by at least 10%, and transmit the gamut-altered emissions to exit the retrofit element. In certain aspects, the preceding GAI threshold may be replaced with one or more Q_gvalues or other GAI values as disclosed herein. In certain embodiments, the light-affecting material may be arranged on a light-transmissive substrate. In certain embodiments, the light-affecting material may be arranged in a non-contacting relationship relative to an outermost light-transmissive surface of a lighting device. In certain embodiments, the light-affecting material may be arranged to be pressed against or adhered (e.g., removably adhered) to an outermost light-transmissive surface of a lighting device, wherein the attachment structure may include an adhesive. In certain embodiments, an attachment structure may be arranged for removable attachment to a base or body structure of a light bulb, or for removable attachment to a luminaire. In certain embodiments, a light-affecting material may be arranged in a substantially planar conformation. In certain embodiments, a light-affecting material may be arranged in a curved, faceted, or other non-planar conformation. In certain embodiments, light-affecting material may be arranged in or on a light-transmissive substrate, and at least one of concentration, thickness, and patterning of the light-affecting material may vary with position along or relative to the light-transmissive substrate.

0132Various features and embodiments of the present disclosure are described with reference to the accompanying figures.

0133<figref idref="DRAWINGS">FIG. 6A</figref> is a schematic elevation view of an interior space <b>40</b> including an overhead (e.g., ceiling-mounted) electrically activated lighting device <b>50</b> arranged to illuminate an indoor environment with light beams propagating in different directions, and with dashed lines <b>34</b> demarking regions having different gamut properties (e.g., GAI and/or Q_gvalues). <figref idref="DRAWINGS">FIG. 6B</figref> is a schematic elevation view of the lighting device <b>50</b> and the dashed lines <b>34</b> depicted in <figref idref="DRAWINGS">FIG. 6A</figref>. The interior space <b>40</b> includes a ceiling <b>41</b>, floor <b>42</b>, walls <b>43</b>, <b>44</b>, wall-mounted features <b>45</b>, <b>46</b>, and a table or elevated surface <b>49</b>. At least one electrically activated emitter <b>55</b> arranged to illuminate first and second light-transmissive surfaces or regions <b>51</b>, <b>52</b> of the electrically activated lighting device <b>50</b>. The first light-transmissive surface or region <b>51</b> is centrally arranged along the electrically activated lighting device <b>50</b> and transmits a group of light beams that are centered in a vertical direction to illuminate the table or elevated surface <b>49</b> as well as the floor <b>42</b> and lower portions of the walls <b>43</b>, <b>44</b>. The second light-transmissive surface or region <b>52</b> is peripherally arranged along the lighting device and transmits a group of light beams that are centered in a non-vertical direction (e.g., predominantly lateral direction) toward the wall-mounted features <b>45</b>, <b>46</b> (preferably including at least one beam in a substantially horizontal direction along a horizontal axis (h)). Dashed lines <b>34</b>, which deviate from a vertical axis (v) by an angle θ, demarcate a transition between (i) a first illuminated region <b>31</b> (R<b>1</b> in <figref idref="DRAWINGS">FIG. 6B</figref>) that is illuminated with light transmitted through the first light-transmissive surface or region and having a first gamut property and (ii) a second illuminated region <b>32</b> (R<b>2</b> in <figref idref="DRAWINGS">FIG. 6B</figref>) that is illuminated with light transmitted through the second light-transmissive surface or region and having a second gamut property that differs from the first gamut property. In certain embodiments, the different gamut properties may include GAI values differing by at least 10%, by at least 15%, or another threshold disclosed herein, and/or Q_gvalues differing by at least 5%, by at least 10%, by at least 15%, or another threshold disclosed herein. In this manner, a single electrically activated lighting device <b>50</b> may be used to illuminate the first and second illuminated regions <b>31</b>, <b>32</b> with light having different gamut properties, such as may be desirable to illuminate the table or elevated surface <b>49</b> with light having a relatively high gamut and to illuminate the wall-mounted features <b>45</b>, <b>46</b> with light having a relatively low gamut, or vice-versa.

0134In certain embodiments, emitters having different gamut properties may be arranged on different (e.g., non-coplanar) support surfaces, and aimed or oriented in different directions to cause beams or emission portions having different gamut properties to be cast in different directions when exiting a lighting device. In certain embodiments, one or more light blocking and/or light-affecting materials may be provided between emitters having different gamut properties.

0135<figref idref="DRAWINGS">FIG. 7</figref> is a side cross-sectional view of at least a portion of a lighting device <b>100</b> including first, second, and third electrically activated light sources <b>121</b>, <b>122</b>A, <b>122</b>B (e.g., preferably having different gamut properties) oriented on differently-angled surfaces <b>111</b>, <b>112</b>, <b>113</b> of a support structure <b>114</b> to emit beams or groups of beams centered in different directions. Preferably, the second and the third light sources <b>122</b>A, <b>122</b>B supported by the differently angled surfaces <b>112</b>, <b>113</b> have gamut properties (e.g., GAI and/or Q_gvalues) that differ from gamut properties of the first light source <b>121</b> supported by the differently angled surface <b>111</b>. Light blocking elements <b>116</b>A, <b>116</b>B extending from the support structure <b>114</b> are arranged between the adjacent electrically activated light sources <b>121</b>, <b>122</b>A, <b>122</b>B, and may optionally include reflective walls. The light blocking elements <b>116</b>A, <b>116</b>B may function to limit overlap and/or mixing of emissions emanating in a lateral direction from portions (e.g., lateral wall surfaces) of the adjacent electrically activated light sources <b>121</b>, <b>122</b>A, <b>122</b>B. A light-transmissive cover <b>130</b>, which may serve as a diffuser, includes tab portions <b>139</b> that may be retained by recesses <b>115</b> defined in the support structure <b>114</b>. Light transition regions <b>135</b>A, <b>135</b>B may be provided in or on the cover <b>130</b> at positions between the electrically activated light sources <b>121</b>, <b>122</b>A, <b>122</b>B. The light transition regions <b>135</b>A, <b>135</b>B may include light scattering material and/or light blocking material, wherein concentration, amount, and/or patterning of light scattering or light blocking material may vary with lateral position along the light-transmissive cover <b>130</b>. The light transition regions <b>135</b>A, <b>135</b>B may function to reduce appearance of a sharp boundary in gamut properties between a first illuminated region R<b>1</b> illuminated by the first electrically activated light source <b>121</b> and a second illuminated region R<b>2</b> illuminated by the second electrically activated light source <b>122</b>A and/or the third electrically activated light source <b>122</b>B. In certain embodiments, the light blocking regions <b>116</b>A, <b>116</b>B and/or the light transition regions <b>135</b>A, <b>135</b>B may be omitted.

0136In certain embodiments, emitters having different gamut properties may be arranged on a single planar support surface or multiple coplanar support surfaces, and one or more optical elements, transition/light blocking elements, and/or light-affecting materials may be used to cause beams or emission portions having different gamut properties to be cast in different directions when exiting a lighting device.

0137<figref idref="DRAWINGS">FIG. 8</figref> is a side cross-sectional view of at least a portion of a lighting device <b>200</b> including groups of electrically activated light sources <b>221</b>, <b>222</b> (e.g., preferably having different gamut properties between groups thereof) oriented on different portions of a substantially planar substrate <b>212</b>, with transition or light blocking elements <b>216</b> and/or light-affecting materials <b>217</b> arranged between adjacent groups of light sources <b>221</b>, <b>222</b>, and with at least one optical element <b>240</b> arranged to direct at least substantial portions of emissions of different groups of light sources <b>221</b>, <b>222</b> in different directions. The optical element <b>240</b> includes light entry regions (e.g., recesses) <b>248</b> arranged to receive emissions of the electrically activated light sources <b>221</b>, <b>222</b>. Edge portions <b>246</b> of the optical element <b>240</b> may comprise reflective material to prevent escape of light emissions. Lateral walls <b>242</b> of the optical element <b>240</b> may be angled away from vertical in a peripheral direction. A central portion <b>241</b> of the optical element may include a concave wall <b>243</b> terminating at a boundary surface <b>245</b> that demarcates a boundary between the lateral walls <b>242</b> and the concave wall <b>243</b>. Optionally arranged in or along the optical element <b>240</b> are transition elements (which may be partially light-transmissive and optionally may include light scattering material) or light blocking elements (which may be reflective) <b>216</b>. The transition elements or light blocking elements <b>216</b> may serve to limit lateral interaction or mixing or emissions of different groups of electrically activated light sources <b>221</b>, <b>222</b>. Additionally or alternatively arranged in or along the optical element <b>240</b> are optional light affecting materials <b>217</b> (e.g., notch filtering materials, lumiphoric materials, and/or color pigments), which may serve to increase gamut of emissions transmitted in a central direction from the concave wall <b>243</b>. In certain embodiments, the lateral walls <b>242</b> or lateral portions of the optical element <b>240</b>, and/or the concave wall <b>243</b> or the central portion <b>241</b> of the optical element <b>240</b> may include one or more light-affecting materials. In operation of the lighting device <b>200</b>, a first set of light beams or first emission portion having a first gamut property (e.g., first GAI or Q_gvalue) is cast in a central (e.g., predominantly vertical) direction to provide a first illuminated region R<b>1</b>, and a second set of light beams or second emission portion having a second gamut property (e.g., second GAI or Q_gvalue) differing from the first gamut property is cast in a peripheral (e.g., predominantly non-vertical) direction to provide a second illuminated region R<b>2</b>. In this manner, beams or emission portions having different gamut properties may be cast in different directions when exiting the lighting device <b>200</b>.

0138In certain embodiments, emitters of a lighting device having different gamut properties may be supported on individual support elements that may be adjustable (e.g., manually deformable) to permit a manufacturer or user to adjust directionality (e.g., including overlap or lack of overlap) of different beams or emission portions having different gamut properties to be cast in different directions when exiting a lighting device.

0139<figref idref="DRAWINGS">FIG. 9</figref> is a side cross-sectional view of at least a portion of a lighting device <b>300</b> (configured as a light fixture <b>301</b> mountable to a pole <b>302</b> using a pole mount <b>303</b>) including multiple electrically activated light sources <b>321</b>, <b>322</b>, <b>323</b> (e.g., preferably having different gamut properties) arranged to emit light in different directions. Each light source <b>321</b>, <b>322</b>, <b>323</b> is supported by a different support element <b>311</b>, <b>312</b>, <b>313</b> extending from a substrate <b>310</b> that is optionally secured to a backing plate <b>305</b> via slide brackets <b>307</b> to permit adjustment. Each support element may be configured to be adjustable (e.g., manually deformable, or adjustable using one or more tools) to permit a manufacturer or user to adjust directionality of different beams or emission portions having different gamut properties to be cast in different directions when exiting a lighting device. A suitable light-transmissive enclosure <b>330</b> to enclose and protect the light fixture <b>301</b> from environmental exposure may be attached to the backing plate <b>305</b> via fasteners <b>338</b> (e.g., screws or clasps). The light-transmissive enclosure <b>330</b> may include multiple transmissive regions <b>331</b>, <b>332</b>, <b>333</b> arranged to receive emissions from different electrically activated light sources <b>321</b>, <b>322</b>, <b>323</b>, with the adjacent transmissive regions <b>331</b>, <b>332</b>, <b>333</b> optionally being separated by boundaries or transitions <b>335</b>, <b>336</b>. In certain embodiments, different electrically activated light sources <b>321</b>, <b>322</b>, <b>323</b> may be arranged to generate emissions with different gamut properties. With electrically activated light sources <b>321</b>, <b>322</b>, <b>323</b> having different gamut properties arranged to illuminate different areas of the light-transmissive enclosure <b>330</b>, beams or emission portions having different gamut properties may be cast in different directions when exiting the lighting device <b>300</b>. In certain embodiments, different transmissive regions <b>331</b>, <b>332</b>, <b>333</b> may include one or more light-affecting materials (e.g., differing in composition, amount, thickness, concentration, and/or patterning) arranged to alter gamut properties of light received from the respective electrically activated light sources <b>321</b>, <b>322</b>, <b>323</b>. With different transmissive regions <b>331</b>, <b>332</b>, <b>333</b> having different gamut-affecting properties and being oriented in different directions, beams or emission portions having different gamut properties may be cast in different directions when exiting the lighting device <b>300</b>. In certain embodiments, electrically activated light sources <b>321</b>, <b>322</b>, <b>323</b> having different gamut properties may be arranged in combination with different transmissive regions <b>331</b>, <b>332</b>, <b>333</b> including one or more light-affecting materials (e.g., differing in composition, concentration, amount, thickness, and/or patterning). In one embodiment, at least one light-affecting material arranged to increase a gamut property to a first value is provided in a first transmissive region <b>331</b>, at least one light-affecting material arranged to increase a gamut property to a second value is provided in a second transmissive region <b>332</b>, and a third transmissive region <b>333</b> may be either devoid of light-affecting material or may include light-affecting material to increase a gamut property to a third value, wherein a gamut property declines in value from the first transmissive region <b>331</b> to the second transmissive region <b>332</b>, and further declines in value from the second transmissive region <b>332</b> to the third transmissive region <b>333</b>. In certain embodiments, separations or boundaries <b>335</b>, <b>336</b> may include a transition (e.g., stepped, gradient, sawtooth, feathered, or other transition) between adjacent transmissive regions <b>331</b>, <b>332</b>, <b>333</b> in order to reduce perception of illumination differences between different surfaces or areas illuminated by different regions of the a lighting device <b>300</b>.

0140In certain embodiments, one or more light-affecting elements may be provided in combination with a single emitter or with multiple emitters having the same gamut properties, whereby a portion of light emissions are arranged to interact with a first light-affecting element, and another portion of light emissions are either (i) transmitted through a second light-affecting element differing from the first light-affecting element or (ii) not transmitted through any light-affecting element, to cause beams or emission portions having different gamut properties to be cast in different directions when exiting a lighting device. In various embodiments, lighting devices may be arranged for direct or for indirect illumination of one or more light-affecting elements.

0141<figref idref="DRAWINGS">FIG. 10</figref> is a side cross-sectional view of at least a portion of a direct emission lighting device <b>400</b> including at least one electrically activated emitter <b>421</b>, a primary reflector <b>410</b>, a secondary reflector <b>440</b>, a heatsink <b>401</b>, and light-transmissive regions <b>451</b>, <b>452</b> having different filtering and/or wavelength conversion properties. The lighting device <b>400</b> may embody a troffer fixture arranged for mounting in a ceiling. Although only a single electrically activated emitter <b>421</b> is shown, it is to be appreciated that in certain embodiments the lighting device <b>400</b> may include multiple electrically activated emitters <b>421</b> that may be linearly arranged (e.g., in a direction extending into or out from the illustration). In certain embodiments, a first light-transmissive region <b>451</b> includes a light-affecting material arranged to increase a gamut property of emissions transmitted therethrough, and second light-transmissive regions <b>452</b> may either be devoid of light-affecting material to adjust a gamut property or may include light-affecting material of a composition, amount, thickness, concentration, or pattern differing from light-affecting material contained in the first light-transmissive region. In this manner, emissions transmitted through the first light-transmissive region <b>451</b> (corresponding to a light output region R<b>1</b>) may have a gamut property (e.g., GAI or Q_g) value that differs from a gamut property value of emissions transmitted through a second light-transmissive region <b>452</b> (corresponding to a light output region R<b>2</b>), permitting different beams or emission portions having different gamut properties to be cast in different directions when exiting the direct emission lighting device <b>400</b>. In certain embodiments, the electrically activated emitter <b>421</b> may include multiple electrically activated emitters having different gamut properties that are separately directed to illuminate different light-transmissive regions. For example, one or more centrally arranged electrically activated emitters having different gamut properties may be arranged to transmit light through a first interior portion <b>431</b> of the direct emission lighting device <b>400</b> to impinge on the first light-transmissive region <b>451</b>, and one or more peripherally arranged electrically activated emitters may be arranged to transmit light through at least one second interior portion <b>432</b> of the device <b>400</b> to impinge on the second light-transmissive region <b>452</b>, wherein the first and second interior portions <b>431</b>, <b>432</b> may be separated by an imaginary or a real boundary <b>434</b> (e.g., including scattering, at least partially reflecting, or at least partially light blocking material).

0142In certain embodiments, light-affecting material may be arranged in or on light-transmissive and/or light-reflective regions to permit light beams with different gamut properties to be output in different directions, and a lighting device may be arranged for indirect lighting.

0143<figref idref="DRAWINGS">FIGS. 11A-11C</figref> illustrate at least portions of a reflected or indirect emission lighting device <b>500</b> including one or more light-affecting regions (e.g., providing filtering and/or wavelength conversion utility) to yield light output regions R<b>1</b>, R<b>2</b> arranged to output light with different gamut properties in different directions. The lighting device <b>500</b> may embody a light fixture suitable for mounting in or for suspension from a ceiling. The lighting device <b>500</b> includes a light engine <b>501</b> including light strips <b>506</b> containing multiple electrically activated emitters <b>505</b> arranged along the perimeter of a cup <b>502</b> and angled generally upward toward the reflector dome <b>511</b>. A control circuit <b>508</b> may be integrated onto the light strips <b>506</b> or may be disposed externally to the cup <b>502</b> or remote from the fixture. The cup <b>502</b> may be supported by laterally-extending arms <b>520</b> that suspend the cup <b>502</b> below the reflector dome <b>511</b> and inboard of an angled pan <b>512</b>. An upper cavity <b>519</b>A is bounded by the reflector dome <b>511</b> and is generally arranged above the cup <b>502</b>, and a lower cavity <b>519</b>B is bounded laterally by the angled pan <b>512</b> and is generally arranged below the cup <b>502</b>. Voids <b>519</b>C between adjacent arms <b>520</b> connect the upper cavity <b>519</b>A and the lower cavity <b>519</b>B to permit passage of at least a portion of light reflected by the reflector dome <b>511</b>. The cup <b>502</b> includes a central panel <b>503</b> and peripheral panels <b>504</b>. The reflector dome <b>511</b> includes a central region <b>517</b> and a peripheral region <b>514</b>. In certain embodiments, at least one light-affecting material may be associated with one or more panels <b>503</b>, <b>504</b> of the cup <b>502</b> and/or associated one or more reflective regions <b>514</b>, <b>517</b> of the reflector dome <b>511</b> in order to produce light with different gamut properties in different directions. In certain embodiments, a central output region R<b>1</b> may include emissions with an elevated gamut property relative to an emissions of a peripheral output region R<b>2</b>. In other embodiments, the opposite result may be obtained.

0144In certain embodiments, one or more of the panels <b>503</b>, <b>504</b> of the cup <b>502</b> may be substantially transmissive, wherein emissions of the electrically activated emitters <b>505</b> may impinge on the panels <b>503</b>, <b>504</b> (whether directly and/or indirectly following reflection from the reflective regions <b>514</b>, <b>517</b> of the reflector dome <b>511</b>) and optionally interact with one or more light-affecting materials arranged in or on the panels <b>503</b>, <b>504</b>. In certain embodiments, light-affecting material may be arranged in differing presence, composition, amount, thickness, concentration, or patterning between the central panel <b>503</b> and the peripheral panels <b>504</b>, such as to permit a gamut property of emissions transmitted through the central panel <b>503</b> to differ from a gamut property of emissions transmitted through one or more of the peripheral panels <b>504</b>. In certain embodiments, the central panel <b>503</b> may be arranged to increase a gamut property more than the peripheral panels <b>504</b>; in other embodiments, the opposite result may be obtained.

0145In certain embodiments, one or more of the panels <b>503</b>, <b>504</b> of the cup <b>502</b> may be substantially transmissive (optionally in combination with one or more light-affecting materials), and at least one light-affecting material may be associated with at least one reflective region <b>514</b>, <b>517</b> of the reflector dome <b>511</b>, whereby a portion of emissions of the electrically activated emitters <b>505</b> may impinge on the one reflective region <b>514</b>, <b>517</b> to affect a gamut property of the emissions, and another portion of emissions of the electrically activated emitters <b>505</b> may impinge on the other reflective region <b>514</b>, <b>517</b> that may be devoid of light-affecting material (or contain a light-affecting material that differs in presence, composition, amount, thickness, concentration, or patterning). The resulting emissions may be transmitted through the cup <b>502</b> and/or through the voids <b>519</b>C to exit the lighting device <b>500</b>. In certain embodiments, the central reflective region <b>517</b> may be arranged to increase a gamut property more than the peripheral reflective region <b>514</b>; in other embodiments, the opposite result may be obtained. In this manner, different regions <b>514</b>, <b>517</b> may be arranged to reflect beams having different gamut properties in different directions.

0146In certain embodiments, one or more of the panels <b>503</b>, <b>504</b> of the cup <b>502</b> may be substantially reflective, and at least one light-affecting material may be associated with at least one reflective region <b>514</b>, <b>517</b> of the reflector dome <b>511</b>, whereby a portion of emissions of the electrically activated emitters <b>505</b> may impinge on the one reflective region <b>514</b>, <b>517</b> to affect a gamut property of the emissions, and another portion of emissions of the electrically activated emitters <b>505</b> may impinge on the other reflective region <b>514</b>, <b>517</b> that may be devoid of light-affecting material (or contain a light-affecting material that differs in presence, composition, amount, thickness, concentration, or patterning). The resulting emissions may be transmitted through the voids <b>519</b>C (i.e., past the cup <b>502</b>) to exit the lighting device <b>500</b>. In certain embodiments, the central reflective region <b>517</b> may be arranged to increase a gamut property more than the peripheral reflective region <b>514</b>; in other embodiments, the opposite result may be obtained. In this manner, different regions <b>514</b>, <b>517</b> may be arranged to reflect beams having different gamut properties in different directions.

0147In certain embodiments, light-affecting material may be arranged in or on a light-transmissive material to permit light beams with different gamut properties to be output in different directions, and a lighting device may be arranged for direct lighting.

0148<figref idref="DRAWINGS">FIG. 12A</figref> illustrates a direct emission lighting device <b>600</b>A including a baffle assembly <b>620</b>, and <figref idref="DRAWINGS">FIG. 12B</figref> illustrates a portion of the lighting device <b>600</b>A without the baffle assembly <b>620</b>.

0149The lighting device <b>600</b>A includes an upper housing <b>616</b> mounted to a heatsink <b>612</b> arranged proximate to a junction box <b>624</b>. A reflective material <b>656</b> (such as metal, polymeric material, microcellular polyethyleneterephthalate, or the like) may be arranged along interior surfaces of the upper housing <b>616</b>. The upper housing <b>616</b> includes an opening adjacent the heatsink <b>612</b> in which is arranged a printed circuit board (PCB) <b>660</b> having LEDs <b>662</b> mounted thereon. The PCB <b>660</b> may be thermally and mechanically coupled to the heatsink <b>612</b>. A basket assembly <b>618</b> includes a frame <b>650</b> which itself includes an internal frame member <b>670</b> and an external frame member <b>672</b> that reflectively define two openings. The internal frame member <b>670</b> defines a central opening in which a first lens <b>652</b> is provided, with the internal frame member <b>670</b> and the first lens <b>652</b> together defining a first light transmitting window of the basket assembly <b>618</b>. One or more films or other diffusing structures <b>658</b> may be provided on or as part of the first lens <b>652</b>. A second lens <b>654</b> is provided in a space between the external frame member <b>672</b> and the internal frame member <b>670</b>. The space between the internal frame member <b>670</b> and the external frame member <b>672</b> and the second lens <b>654</b> define a second light transmitting window of the basket assembly <b>618</b>. In certain embodiments, provision of one or more second light transmitting windows about the periphery of a first light transmitting window provide a softened transition from a bright central portion of the basket assembly <b>618</b> to a less bright peripheral portion of the fixture (e.g., with lower luminous intensity outer windows).

0150In certain embodiments, at least one light-affecting material may be associated with one or more of the first lens <b>652</b> and the second lens <b>654</b>, with the at least one light-affecting material differing in presence, composition, amount, thickness, concentration, or patterning between the respective lenses <b>652</b>, <b>654</b>. In this manner, gamut properties of emissions transmitted through the lenses <b>652</b>, <b>654</b> may be different, thereby permitting beams having different gamut properties to escape the device <b>600</b>A in different directions. In certain embodiments, a central output region R<b>1</b> may include emissions with an elevated gamut property relative to an emissions of a peripheral output region R<b>2</b>. In other embodiments, the opposite result may be obtained.

0151In certain embodiments (as shown in <figref idref="DRAWINGS">FIG. 12A</figref>), the lighting device <b>600</b>A may include a centrally arranged light-affecting element <b>690</b>A (e.g., disposed outside a cavity defined by the baffle assembly <b>620</b>), optionally suspended by supports <b>691</b>A. The light-affecting element <b>690</b>A includes at least one light-affecting material and is arranged to receive and increase a gamut property of a central portion of emissions of the lighting device <b>600</b>A, such that a central output region R<b>1</b> may include emissions with an elevated gamut property relative to an emissions of a peripheral output region R<b>2</b>.

0152In certain embodiments, a light-affecting element may be arranged within a cavity defined by a baffle (or other reflector) of a lighting device.

0153<figref idref="DRAWINGS">FIG. 12C</figref> illustrates another direct emission lighting device <b>600</b>C similar to the device <b>600</b>A of <figref idref="DRAWINGS">FIG. 12A</figref>, but including a centrally arranged light-affecting element <b>690</b>C disposed outside within a cavity defined by the baffle assembly <b>620</b>, optionally suspended by supports <b>691</b>C. The light-affecting element <b>690</b>C includes at least one light-affecting material and is arranged to receive and increase a gamut property of a central portion of emissions of the lighting device <b>600</b>C, such that a central output region (e.g., region R<b>1</b> in <figref idref="DRAWINGS">FIG. 12A</figref>) may include emissions with an elevated gamut property relative to an emissions of a peripheral output region (e.g., region R<b>2</b> in <figref idref="DRAWINGS">FIG. 12A</figref>).

0154In certain embodiments, a light-affecting element may be arranged along a peripheral portion of a lighting device in order to increase gamut of peripherally-directed (as opposed to centrally-directed) emissions of the lighting device.

0155<figref idref="DRAWINGS">FIG. 12D</figref> is a side elevation view of a direct emission lighting device <b>600</b>D similar to the device <b>600</b>A of <figref idref="DRAWINGS">FIG. 12A</figref>, but centrally arranged light-affecting element <b>690</b>D disposed outside within a cavity defined by the baffle assembly <b>620</b>, optionally suspended by supports <b>691</b>D. The light-affecting element <b>690</b>D includes at least one light-affecting material and is arranged to receive and increase a gamut property of a peripheral portion of emissions of the lighting device <b>600</b>D, such that a peripheral output region (e.g., region R<b>2</b> in <figref idref="DRAWINGS">FIG. 12A</figref>) may include emissions with an elevated gamut property relative to an emissions of a central output region (e.g., region R<b>1</b> in <figref idref="DRAWINGS">FIG. 12A</figref>).

0156In certain embodiments, at least one light-affecting material may be associated with a reflector and/or an externally arranged light-transmissive element of an indirect (e.g., reflected) illumination lighting device. In certain embodiments, at least one light-affecting material or light-affecting element may optionally be arranged for removable attachment to a lighting device (e.g., a light fixture), such as by attachment to a heatsink thereof.

0157<figref idref="DRAWINGS">FIG. 13A</figref> illustrates a lighting device embodied in a troffer-type (in-ceiling linear) light fixture <b>700</b> arranged to incorporate multiple electrically activated emitters <b>726</b> (e.g., LEDs) as disclosed herein arranged on a substrate <b>724</b> in thermal communication with a heatsink <b>702</b>. <figref idref="DRAWINGS">FIG. 13B</figref> is a side cross-sectional view of a portion of a reflected emission lighting device according to <figref idref="DRAWINGS">FIG. 13A</figref>. The light fixture <b>700</b> includes a pan <b>701</b>, reflector <b>708</b>, and end caps <b>710</b>, <b>711</b>. The end cap <b>710</b> is larger than the end cap <b>711</b> and is shaped to act as a circuit box to house electronics used to drive and control the light source (e.g., rectifiers, regulators, timing circuitry, etc.). Although a reflector may take various shapes, in the illustrated embodiment, the reflector <b>708</b> includes a flat region opposite the heatsink <b>702</b>, with the reflector including a central region <b>719</b> and a peripheral region <b>718</b>. In alternative embodiments, the reflector <b>708</b> could be parabolic in shape, or include two or more parabolic regions. The light fixture <b>700</b> also includes a diffuser lens assembly including lens plates <b>715</b>, <b>716</b>, disposed adjacent to sides of the heatsink <b>702</b> and extending to the periphery of the reflector <b>708</b> as shown in <figref idref="DRAWINGS">FIG. 13B</figref>.

0158In certain embodiments, at least one light-affecting material may be associated with the one or more regions <b>718</b>, <b>719</b> of the reflector <b>708</b> and/or associated with light-transmissive elements <b>791</b>, <b>792</b> arranged proximate to the lens plates <b>715</b>, <b>716</b> (e.g., extending across only a central portion of the lens plates <b>715</b>, <b>716</b> proximate to the heatsink <b>702</b>), in order to transmit beams having different gamut properties in different directions. In certain embodiments, the light-transmissive elements <b>791</b>, <b>792</b> may be coated on, impregnated in, or otherwise affixed to the lens plates <b>715</b>, <b>716</b>. In certain embodiments, the light-transmissive elements <b>791</b>, <b>792</b> may be arranged for removable attachment to the lens plates <b>715</b>, <b>716</b>, the heatsink <b>702</b>, and/or one or more trim structures (not shown).

0159In certain embodiments, at least one light-affecting material may be associated with the at least one region <b>718</b>, <b>719</b> of the reflector <b>708</b>, and another of the regions <b>718</b>, <b>719</b> of the reflector may be devoid of light-affecting material (or contain a light-affecting material that differs in presence, composition, amount, thickness, concentration, or patterning), so that the regions <b>718</b>, <b>719</b> differently affect gamut of light received from the electrically activated emitters <b>726</b> and reflected toward the lens plates <b>715</b>, <b>716</b>. In certain embodiments, presence, composition, amount, thickness, concentration, or patterning of light-affecting material may vary in a stepwise or substantially continuous (e.g., gradient) manner with respect to position along the reflector <b>708</b> to provide a desired transition in gamut affecting properties.

0160In certain embodiments, at least one light-affecting material may be associated with the light-transmissive elements <b>791</b>, <b>792</b> extending across only a central portion of the lens plates <b>715</b>, <b>716</b> proximate to the heatsink <b>702</b>, and the remainder (e.g., peripheral portions) of the lens plates <b>715</b>, <b>716</b> may be devoid of any associated light-affecting material. In alternative embodiments, light-transmissive elements may extend across only a peripheral portion of the lens plates <b>715</b>, <b>716</b> proximate to the reflector <b>708</b>, and the remainder (e.g., central portions) of the lens plates <b>715</b>, <b>716</b> may be devoid of any associated light-affecting material. In certain embodiments, presence, composition, amount, thickness, concentration, or patterning of light-affecting material may vary in a stepwise or substantially continuous (e.g., gradient) manner with respect to position in or along the light-transmissive elements <b>791</b>, <b>792</b> to provide a desired transition in gamut affecting properties.

0161In operation of the lighting device <b>700</b>, emissions from the electrically activated emitters <b>726</b> impinge on the central region <b>719</b> and peripheral region <b>718</b> of the reflector <b>708</b> for reflection toward the lens plates <b>715</b>, <b>716</b>. Gamut properties of different portions of the reflected emissions may be affected differently by the central region <b>719</b> and the peripheral region <b>718</b> depending on differing presence of one or more light-affecting materials as disclosed herein. Alternatively, or additionally, gamut properties of different portions of reflected emissions may be affected by light-affecting material associated with the light-transmissive elements <b>791</b>, <b>792</b> upon transmission of reflected emissions through the lens plates <b>715</b>, <b>716</b>. In this manner, beams having different gamut properties may be transmitted in different directions from the lighting device <b>700</b>. In certain embodiments, a central output region R<b>1</b> (e.g., below the light-transmissive elements <b>791</b>, <b>792</b>) may include emissions with an elevated gamut property relative to an emissions of a peripheral output region R<b>2</b>. In other embodiments, the opposite result may be obtained.

0162In certain embodiments, one or more lumiphoric materials, notch filtering materials, or other light-affecting materials may be associated with one or more electrically activated emitters <b>726</b>. In certain embodiments, the lighting device <b>700</b> may include multiple electrically activated emitters <b>726</b> arranged to emit beams with different gamut properties in different directions.

0163<figref idref="DRAWINGS">FIG. 13C</figref> illustrates a portion of a reflected emission lighting device <b>700</b>A similar to the device illustrated in <figref idref="DRAWINGS">FIG. 13B</figref>, with the lighting device <b>700</b>A, but with light-transmissive elements <b>791</b>A, <b>792</b>A (preferably including at least one light-affecting material arranged to increase a gamut property light transmitted therethrough) that are spatially separated from the lens plates <b>715</b>, <b>716</b>. Such transmissive elements <b>791</b>A, <b>792</b>A may optionally be arranged for removable attachment (e.g., using clips or fasteners <b>793</b>, <b>794</b>) to the lens plates <b>715</b>, <b>716</b>, the heatsink <b>702</b>, and/or one or more trim structures (not shown). Removable attachment of the transmissive elements <b>791</b>A, <b>792</b>A including light-affecting materials may permit a user or manufacturer to provide or adjust gamut affecting properties of a light fixture without requiring provision or installation of a new fixture.

0164In certain embodiments, a solid state emitter package may include one or more solid state emitter chips and be arranged to emit light beams with different gamut properties in different directions. Such emitter chips may optionally include angled or beveled upper edges with a non-rectangular (e.g., polygonal) cross-section, with such shape serving to enhance light extraction. In certain embodiments, one or more light-affecting materials may be associated with one or more solid state emitters and/or a lens or optical element associated with the package.

0165<figref idref="DRAWINGS">FIG. 14</figref> is a side cross-sectional view of at least a portion of a solid state light-emitting device <b>890</b> including multiple solid state emitter (e.g., LED) chips <b>895</b> arranged over a submount <b>891</b> in flip-chip configuration, with both anode and cathode connections on the bottom of the solid state emitter chips <b>895</b>. The submount <b>891</b> (e.g., alumina, aluminum nitride, high temperature polymers, etc.) may be covered with a pattern of metal (e.g., traces) <b>893</b> that may be used to interconnect the emitter chips <b>895</b> and provide connection to a power supply. The metal pattern <b>893</b> may include connection pads <b>892</b> with insulating material <b>894</b> therebetween. As illustrated, the emitter chips <b>895</b> include angled or beveled upper edges with a non-rectangular (e.g., polygonal) cross-section. One or more emitter chips <b>895</b> may optionally be coated with one or more light-affecting materials (e.g., lumiphoric material, notch filtering material, etc.) in at least one conformal layer <b>896</b> and arranged under a hemispherical optical element (e.g., lens) <b>898</b>, with the at least one conformal layer <b>896</b> following the shape and contour of multiple surfaces of the emitter chips <b>895</b> (preferably with substantially constant thickness). In certain embodiments, concentration or amount of at least one light-affecting material in the conformal layer <b>896</b> may be varied with position relative to the emitter chips <b>895</b>. As shown in <figref idref="DRAWINGS">FIG. 14</figref>, the at least one conformal layer <b>896</b> may extend over, between and laterally beyond the chips <b>895</b> (such as over a reflective material disposed between or adjacent to the emitter chips <b>895</b>). The optical element <b>898</b> may be separated from the emitter chips <b>895</b> via a gap or an intervening material <b>897</b>, which may include encapsulant or a fluid medium such as liquid or gel (e.g., mineral oil, perfluorinated polyether (PFPE) liquid, or other fluorinated or halogenated liquid or gel). If provided, such intervening material <b>897</b> may also include an index matching medium characterized by a refractive index that provides for reduced or minimal reflection or internal refraction of light emissions. In certain embodiments, the intervening material <b>897</b> and the optical element <b>898</b> may embody a single element, such as molded silicone. In certain embodiments, the optical element <b>898</b> may include one or more light-affecting materials (e.g., lumiphoric material, notch filtering material, color pigment material, etc.) arranged to affect (e.g., increase) at least one gamut property of light transmitted therethrough. Such light-affecting material may be doped, coated, impregnated, or otherwise provided in or on at least a portion of the optical element <b>898</b>. As shown in <figref idref="DRAWINGS">FIG. 14</figref>, a first (e.g., central) portion <b>898</b>A of the optical element <b>898</b> may include a light-affecting material at one concentration, and a second (e.g., peripheral) portion <b>898</b>B of the optical element <b>898</b> may be either devoid of light-affecting material or include light-affecting material at a different concentration relative to the first (central) portion <b>898</b>A. In operation of the solid state light emitting device <b>890</b>, upon passage of light through one or more light-affecting materials (e.g., associated with different portions of the at least one conformal layer <b>896</b> and/or different portions of the optical element <b>898</b>), at least two beams or portions of light emitted in different directions from the lighting device <b>890</b> may exhibit different gamut properties. Alternatively, two or more emitter chips <b>895</b> or groups thereof (optionally in conjunction with lumiphoric material and/or notch filtering material) may be aimed in different directions and arranged to generate emissions having different gamut properties, in order to emit beams with different gamut properties in different directions. In certain embodiments, a central output region R<b>1</b> may include emissions with an elevated gamut property relative to an emissions of a peripheral output region R<b>2</b>. In other embodiments, the opposite result may be obtained.

0166In certain embodiments, at least a portion of a diffuser of a lighting device may include at least one light-affecting material. In certain embodiments, at least one light-affecting material (arranged to affect gamut properties) may differ in presence, composition, thickness, concentration, and/or patterning with respect to position in or on the diffuser, such that different portions of the diffuser are arranged to transmit light beams having different gamut properties.

0167<figref idref="DRAWINGS">FIG. 15</figref> is a side cross-sectional view of a pendant mount direct lighting device <b>900</b> including a diffuser <b>915</b> with a central region <b>919</b> including a light-affecting material arranged to affect at least one gamut property, and with a peripheral region <b>917</b> that is either devoid of light-affecting material or includes light-affecting material differing in presence, composition, thickness, concentration, and/or patterning relative to the central region <b>919</b>. Light-affecting material may be doped, coated, impregnated, or otherwise provided in or on at least portions of the diffuser <b>915</b>. An electrically activated light emitter <b>926</b> is arranged within a reflector <b>928</b> suspended by a first support <b>920</b>, with the reflector <b>928</b> and electrically activated light emitter <b>926</b> being arranged to cast light in a generally downward direction toward the diffuser <b>915</b>, which is supported by a diffuser support element <b>910</b>. At least one light-affecting material (e.g., lumiphoric material, notch filtering material, color pigment material, etc.) may be arranged to affect (e.g., increase) at least one gamut property of light transmitted therethrough. In operation of the device <b>900</b>, upon passage of light through one or more light-affecting materials associated with different portions of the diffuser <b>915</b>, at least two beams or portions of light emitted in different directions from the lighting device <b>900</b> may exhibit different gamut properties. In certain embodiments, a central output region R<b>1</b> may include emissions with an elevated gamut property relative to an emissions of a peripheral output region R<b>2</b>. In other embodiments, the opposite result may be obtained.

0168In certain embodiments, boundaries between light-affecting regions and non-light-affecting regions, or between different light-affecting regions, may be abrupt or may including one or more transition features (e.g., steps, gradients, feathered transitions, sawtooth transitions, or the like) to reduce perceptibility of a boundary between first and second light-emitting regions or areas of a lighting device. In certain embodiments, such transitions may be arranged in or along external portions or external surfaces of a lighting device. In other embodiments, transition regions may be arranged in or along surfaces or structures internal to a lighting device.

0169<figref idref="DRAWINGS">FIG. 16</figref> illustrates a lighting device <b>1000</b> embodied in a light bulb including a central region <b>1022</b> with at least one light-affecting material arranged to affect at least one gamut property of light emissions arranged in or on an upper portion <b>1020</b> of a hemispherical globe. A peripheral region <b>1025</b> arranged in or on a lower portion of the hemispherical globe may either be devoid of light-affecting material or may include light-affecting material having differing concentration, amount, thickness, and/or patterning relative to the central region <b>1022</b>. An abrupt transition in light-affecting material is provided between the central region <b>1022</b> and the peripheral region <b>1025</b>. At least one electrically activated emitter <b>1010</b> positioned on a reflective submount <b>1011</b> may be arranged within a cavity <b>1028</b> of the lighting device <b>1000</b>. A body structure <b>1005</b> to which the hemispherical globe may be attached may include a lateral contact <b>1006</b> and a foot contact <b>1007</b> arranged to mate with an Edison-type threaded light bulb socket. In operation of the lighting device <b>1000</b>, upon passage of light through one or more light-affecting materials associated with the central region <b>1022</b>, a first beam having an elevated gamut property is transmitted by the central region <b>1022</b>, and upon passage of light though the peripheral region <b>1025</b>, a second beam having a relatively lower gamut property is transmitted by the peripheral region <b>1025</b>. Thus, at least two beams or portions of light emitted in different directions from the lighting device <b>1000</b> may exhibit different gamut properties. In certain embodiments, a central output region R<b>1</b> may include emissions with an elevated gamut property relative to an emissions of a peripheral output region R<b>2</b>. In other embodiments, the opposite result may be obtained if the peripheral region <b>1025</b> includes light-affecting material in an amount sufficient to increase at least one gamut property more than the central region <b>1022</b>.

0170<figref idref="DRAWINGS">FIG. 17</figref> illustrates a lighting device <b>1030</b> embodied in a light bulb including a centrally arranged light-affecting region <b>1052</b> arranged in or on a hemispherical globe <b>1050</b>, with a sawtooth or feathered transition region <b>1059</b> between the centrally arranged light-affecting region <b>1052</b> and a peripheral region <b>1055</b> that may either be devoid of light-affecting material or may include light-affecting material having differing concentration, amount, thickness, and/or patterning relative to the central region <b>1052</b>. The lighting device <b>1030</b> includes at least one electrically activated emitter <b>1040</b> and a body structure <b>1035</b>. In operation of the lighting device <b>1030</b>, upon passage of light through one or more light-affecting materials associated with the centrally arranged light-affecting region <b>1052</b>, a first beam having an elevated gamut property is transmitted by the centrally arranged light-affecting region <b>1052</b>, and upon passage of light though the peripheral region <b>1055</b>, a second beam having a relatively lower gamut property is transmitted by the peripheral region <b>1055</b>. Light transmitted through the hemispherical globe <b>1050</b> proximate to the sawtooth or feathered transition region <b>1059</b> has a less abrupt boundary than the lighting device of <figref idref="DRAWINGS">FIG. 16</figref>. The lighting device <b>1030</b> is arranged to emit at least two beams or portions of light in different directions exhibiting different gamut properties. In certain embodiments, a central output region R<b>1</b> may include emissions with an elevated gamut property relative to an emissions of a peripheral output region R<b>2</b>, and a transition output region R<b>1</b>A is provided therebetween. In other embodiments, a peripheral output region R<b>2</b> may be arranged to increase at least one gamut property more than the central output region R<b>1</b>.

0171<figref idref="DRAWINGS">FIG. 18</figref> illustrates a lighting device <b>1060</b> embodied in a light bulb including a central region <b>1082</b> including light-affecting material arranged in or on a hemispherical globe <b>1080</b>, with a stepped or gradient transition region <b>1089</b> (e.g., including multiple transition subregions <b>1083</b>, <b>1084</b>) between the central region <b>1082</b> and a peripheral region <b>1085</b>. The peripheral region <b>1085</b> that may either be devoid of light-affecting material or may include light-affecting material having differing concentration, amount, thickness, and/or patterning relative to the central region <b>1082</b>. The lighting device <b>1030</b> includes at least one electrically activated emitter <b>1070</b> and a body structure <b>1065</b>. In operation of the lighting device <b>1060</b>, upon passage of light through one or more light-affecting materials associated with the central region <b>1082</b>, a first beam having an elevated gamut property is transmitted by the central region <b>1082</b>, and upon passage of light though the peripheral region <b>1085</b>, a second beam having a relatively lower gamut property is transmitted by the peripheral region <b>1085</b>. Light transmitted through the hemispherical globe <b>1080</b> proximate to the stepped or gradient transition region <b>1089</b> (e.g., including subregions <b>1083</b>, <b>1084</b>) has a less abrupt boundary than the lighting device of <figref idref="DRAWINGS">FIG. 16</figref>. The lighting device <b>1060</b> is arranged to emit at least two beams or portions of light in different directions and exhibiting different gamut properties. In certain embodiments, a central output region R<b>1</b> may include emissions with an elevated gamut property relative to an emissions of a peripheral output region R<b>2</b>, and transition output regions R<b>3</b>A, R<b>3</b>B are provided therebetween. In other embodiments, the peripheral output region R<b>2</b> may be arranged to increase at least one gamut property more than the central output region R<b>1</b>.

0172<figref idref="DRAWINGS">FIG. 19A</figref> is a perspective view of a lighting device embodied in a reflector-type light bulb <b>1100</b> including a central region <b>1111</b> including at least one light-affecting material (e.g., arranged to increase a gamut property of light transmitted therethrough) arranged in or on a lens or cover portion <b>1110</b> of the bulb. A peripheral region <b>1112</b> may either be devoid of light-affecting material or may include light-affecting material having differing concentration, amount, thickness, and/or patterning relative to the central region <b>1111</b>. The reflector type light bulb <b>1100</b> includes at least one electrically activated emitter (not shown) arranged proximate in a reflector <b>1108</b> extending from a body portion <b>1104</b> having a lateral contact <b>1102</b> and a foot contact <b>1101</b> arranged to mate with an Edison-type threaded light bulb socket. In operation of the device <b>1100</b>, upon passage of light through one or more light-affecting materials associated with the central region <b>1111</b>, a first beam having an elevated gamut property is transmitted by the central region <b>1111</b>, and upon passage of light though the peripheral region <b>1112</b>, a second beam having a relatively lower gamut property is transmitted by the peripheral region <b>1112</b>. The light bulb <b>1100</b> may include a relatively abrupt transition between the central region <b>1111</b> and the peripheral region <b>1112</b>.

0173<figref idref="DRAWINGS">FIG. 19B</figref> illustrates a circular lens or cover portion <b>1110</b>B of a light bulb including a central region <b>1111</b>B including light-affecting material disposed therein or thereon, with a stepped or gradient transition (including subregions <b>1113</b>B<b>1</b>, <b>1113</b>B<b>2</b>) between the central region <b>1111</b>B and a peripheral region <b>1112</b>B. The peripheral region <b>1112</b>B may either be devoid of light-affecting material or may include light-affecting material having differing concentration, amount, thickness, and/or patterning relative to the central region <b>1111</b>B. The gradient transition subregions <b>1113</b>B<b>1</b>, <b>1113</b>B<b>2</b> may include light-affecting material in an amount, thickness, concentration, or pattern between that of the central region <b>1111</b>B and peripheral region <b>1112</b>B.

0174<figref idref="DRAWINGS">FIG. 19C</figref> illustrates a circular lens or cover portion <b>1110</b>C of a light bulb including a central region <b>1111</b>C including light-affecting material disposed therein or thereon, with a sawtooth or feathered transition <b>1113</b>C between the central region <b>1111</b>C and a peripheral region <b>1112</b>C. The peripheral region <b>1112</b>C may either be devoid of light-affecting material or may include light-affecting material having differing concentration, amount, thickness, and/or patterning relative to the central region <b>1111</b>C.

0175In certain embodiments, a peripheral region of a lighting device may be arranged to provide a light beam with an increased gamut property relative to a beam provided by a central region of a lighting device.

0176<figref idref="DRAWINGS">FIG. 20</figref> illustrates lighting device <b>1200</b> embodied in a light bulb including at least one electrically activated emitter <b>1210</b> arranged within a cavity <b>1228</b> of hemispherical globe <b>1220</b> that may serve as a diffuser, wherein a peripheral region <b>1215</b> of the hemispherical globe <b>1220</b> (proximate to a tapered body portion <b>1205</b>A and a base portion <b>1206</b> of the lighting device <b>1200</b>) includes a light-affecting material arranged to increase a gamut property of emissions transmitted therethrough, and a central region <b>1222</b> of the hemispherical globe <b>1220</b> is either devoid of light-affecting material or may include light-affecting material having differing concentration, amount, thickness, and/or patterning relative to the peripheral region <b>1215</b>, whereby light transmitted through the central region <b>1222</b> has a lower gamut property value than light transmitted through the peripheral region <b>1215</b>. In operation of the lighting device <b>1200</b>, upon passage of light through one or more light-affecting materials associated with the peripheral region <b>1215</b>, a first beam having an elevated gamut property is transmitted by the peripheral region <b>1215</b>, and upon passage of light though the central region <b>1222</b>, a second beam having a relatively lower gamut property is transmitted by the central region <b>1222</b>. In certain embodiments, a peripheral output region R<b>1</b> may include emissions with an elevated gamut property relative to an emissions of a central output region R<b>2</b>.

0177In certain embodiments, one or more light-affecting materials as disclosed herein may be arranged within an interior portion or cavity of a lighting device that is bounded by a lens, diffuser, or globe in fluid communication with an ambient environment, wherein the one or more light-affecting materials are not arranged in contact with the lens, diffuser, or globe. In certain embodiments, the one or more light-affecting materials may be associated with a light-transmissive element that is internal to the lighting device and not in fluid communication with an ambient environment, wherein the light-transmissive element may be arranged within a cavity bounded by the lens, diffuser, or globe.

0178<figref idref="DRAWINGS">FIG. 21</figref> illustrates a lighting device <b>1300</b> embodied in a light bulb including at least one electrically activated emitter <b>1306</b> arranged within a first cavity or space <b>1304</b> bounded by an internally arranged light-transmissive element <b>1311</b>. A first (e.g., central) portion <b>1313</b> of the internally arranged light-transmissive element <b>1311</b> comprises a light-affecting material arranged to increase a gamut property of light emissions transmitted therethrough, and a second (e.g., peripheral) portion <b>1312</b> of the internally arranged light-transmissive element <b>1311</b> is either devoid of light-affecting material or may include light-affecting material having differing concentration, amount, thickness, and/or patterning relative to the central portion <b>1313</b>, whereby light transmitted through the peripheral portion <b>1312</b> has a lower gamut property value than light transmitted through the central portion <b>1313</b>. The internally arranged light-transmissive element <b>1311</b> is arranged within a cavity or space <b>1304</b>, <b>1309</b> bounded by a curved or hemispherical globe <b>1308</b>, which may also serve as a diffuser. In certain embodiments, one or both of the cavities or spaces <b>1304</b>, <b>1309</b> may be hollow, or may include a light-transmissive medium therein. In certain embodiments, a light-transmissive medium may comprise a fluid medium that may be arranged to conduct heat to a heatsink <b>1303</b> arranged between the at least one electrically activated emitter <b>1306</b> and electrical contacts (e.g., a lateral contact <b>1302</b> and a foot contact <b>1301</b>) associated with the lighting device <b>1300</b>. The lighting device <b>1300</b> is arranged to emit at least two beams or portions of light in different directions and exhibiting different gamut properties. In certain embodiments, a central output region R<b>1</b> may include emissions with an elevated gamut property relative to an emissions of a peripheral output region R<b>2</b>. In other embodiments, an opposite result may be obtained by repositioning light-affecting material among the peripheral portion <b>1312</b> and the central portion <b>1313</b> of the internally arranged light-transmissive element <b>1311</b>.

0179In certain embodiments, electrically activated emitters of a lighting device may be arranged to produce emissions having different gamut properties and may be oriented in different directions to emit at least two beams or portions of light that exhibit different gamut properties in different directions. In certain embodiments, such a lighting device may be embodied in a light bulb, and multiple electrically activated emitters may be supported by a single support column, substrate, or other support element.

0180<figref idref="DRAWINGS">FIG. 22</figref> illustrates a lighting device <b>1400</b> embodied in a light bulb including multiple electrically activated light emitters <b>1411</b>, <b>1412</b> supported by a central support <b>1410</b> including a horizontal surface <b>1415</b> and multiple vertical surfaces <b>1416</b>, with the central support <b>1410</b> being supported by a column <b>1408</b> extending upward from a body structure <b>1403</b> having multiple fins <b>1405</b> extending from a central core <b>1404</b>. The lighting device <b>1400</b> includes a lateral contact <b>1402</b> and a foot contact <b>1401</b> suitable for mating with a threaded Edison-type light bulb socket. The electrically activated emitters <b>1411</b>, <b>1412</b> and central support <b>1410</b> are arranged within a cavity bounded by a hemispherical globe <b>1420</b>. The electrically activated light emitters <b>1411</b> supported by the horizontal surface <b>1415</b> may be arranged to produce emissions having a gamut property that differs from emissions produced by the electrically activated light emitters <b>1412</b> supported by the vertical surfaces <b>1416</b>. In certain embodiments, partial light blocking and/or diffusing elements <b>1419</b> may be arranged between the horizontally and vertically arranged electrically activated light emitters <b>1411</b>, <b>1412</b>. The lighting device <b>1400</b> is arranged to emit at least two beams or portions of light in different directions and exhibit different gamut properties, owing to different gamut properties of the electrically activated light emitters <b>1411</b>, <b>1412</b> aimed in different directions. In certain embodiments, a central output region R<b>1</b> may include emissions with an elevated gamut property relative to an emissions of a peripheral output region R<b>2</b>. In other embodiments, an opposite result may be obtained.

0181In certain embodiments, a light-affecting material may be associated with a reflector arranged to receive only a portion of light emitted by one or more electrically activated emitters, with the light-affecting material being arranged to affect (e.g., increase) a gamut property of reflected emissions. In certain embodiments, a reflector may include multiple segments radiating out from a single support, wherein a portion of light emitted by one or more solid state light emitters may impinge on light-affecting material, and another portion of light may escape between the multiple reflector segments. Such a reflector may be non-planar in shape.

0182<figref idref="DRAWINGS">FIG. 23A</figref> illustrates a non-planar, substantially flower-shaped light-affecting structure <b>1550</b> arranged to be positioned between electrically activated light emitters and a lens or diffuser of a lighting device. The light-affecting structure <b>1550</b> includes multiple curved segments <b>1556</b> extending upward and outward from a tubular base <b>1552</b>, with gams <b>1562</b> between adjacent segments <b>1556</b>. Each segment <b>1556</b> may include an upper surface <b>1554</b> arranged distal from one or more electrically activated emitters (such as emitters <b>1558</b> illustrated in <figref idref="DRAWINGS">FIG. 23C</figref>), and may include a lower surface <b>1557</b> including at least one light-affecting material arranged to increase a gamut property of light reflected by the lower surface <b>1557</b>. <figref idref="DRAWINGS">FIG. 23B</figref> is a top plan view of the light-affecting structure <b>1550</b> of <figref idref="DRAWINGS">FIG. 23A</figref>. <figref idref="DRAWINGS">FIG. 23C</figref> is a side cross-sectional view of at least a portion of a lighting device <b>1500</b> including the light-affecting structure <b>1550</b> of <figref idref="DRAWINGS">FIGS. 23A-23B</figref> positioned between electrically activated light emitters <b>1558</b> and a curved lens or globe <b>1564</b> which may serve as a diffuser. Although <figref idref="DRAWINGS">FIG. 23C</figref> illustrates the segments <b>1556</b> as having substantially the same shape and curvature, in certain embodiments one or more segments may have a different shape and/or curvature, as indicated by a modified segment <b>1560</b> illustrated in dashed lines. The lighting device <b>1500</b> is arranged to emit at least two beams or portions of light in different directions and exhibit different gamut properties, owing to the presence of light-affecting material arranged in or on lower surfaces <b>1557</b> of the segments <b>1556</b>. In operation of the lighting device <b>1500</b>, one portion of emissions generated by the electrically activated light emitters <b>1558</b> is transmitted upward and/or laterally outward without impinging on lower surfaces <b>1557</b> of the segments <b>1556</b>, whereas another portion of emissions generated by the electrically activated light emitters <b>1558</b> impinges on lower surfaces <b>1557</b> of the segments <b>1556</b> to interact with light-affecting material and be reflected in a peripheral direction. In this manner, a peripheral output region R<b>1</b> may include emissions with an elevated gamut property relative to an emissions of a central output region R<b>1</b>.

0183In certain embodiments, at least one light-affecting material may be suspended or otherwise arranged within a light-transmissive element that spans across a portion of an interior of a lighting device. In certain embodiments, the light-transmissive element may be non-planar in shape.

0184<figref idref="DRAWINGS">FIG. 24</figref> illustrates a lighting device <b>1600</b> that may be embodied in a light bulb including a body structure or base <b>1602</b>, at least one electrically activated emitter <b>1604</b>, a light-transmissive lens or globe <b>1606</b> defining an internal cavity <b>1609</b>, and a light-transmissive element <b>1608</b> that spans across a portion of the internal cavity <b>1609</b>, that includes at least one light-affecting material, and that is suspended within the internal cavity <b>1609</b> by at least one internal support <b>1607</b> extending from the base <b>1602</b>. The light-affecting material associated with the light-transmissive element <b>1608</b> may be arranged to affect (e.g., increase) gamut of emissions transmitted therethrough. The lighting device <b>1600</b> is arranged to emit at least two beams or portions of light in different directions and exhibit different gamut properties. In operation of the lighting device <b>1600</b>, a first portion of emissions generated by the at least one electrically activated emitter <b>1604</b> is transmitted through the light-transmissive element <b>1608</b> and interacts with the light-affecting material to affect (e.g., increase) a gamut property of such emissions, and a second portion of emissions generated by the at least one electrically activated emitter <b>1604</b> escapes the lighting device <b>1600</b> without impingement on the light-transmissive element <b>1608</b>. In certain embodiments, a central output region R<b>1</b> may include emissions with an elevated gamut property relative to an emissions of a peripheral output region R<b>2</b>.

0185<figref idref="DRAWINGS">FIG. 25</figref> illustrates a side cross-sectional view of at least a portion of another lighting device <b>1620</b> substantially similar to the device of <figref idref="DRAWINGS">FIG. 24</figref>, but with a light-transmissive element that is suspended within a cavity <b>1629</b> by at least one internal support <b>1627</b> that extends from a light-transmissive lens or globe <b>1626</b> arranged to bound the cavity <b>1629</b> of the lighting device <b>1620</b>. The lighting device <b>1620</b> includes at least one electrically activated emitter <b>1624</b> and a body structure or base <b>1622</b>. The lighting device <b>1620</b> is arranged to emit at least two beams or portions of light in different directions and exhibiting different gamut properties. In operation of the lighting device <b>1620</b>, a first portion of emissions generated by the at least one electrically activated emitter <b>1624</b> is transmitted through a light-transmissive element <b>1628</b> and interacts with the light-affecting material to affect (e.g., increase) a gamut property of such emissions, and a second portion of emissions generated by the at least one electrically activated emitter <b>1624</b> escapes the lighting device <b>1620</b> without impingement on the light-transmissive element <b>1628</b>. In certain embodiments, a central output region R<b>1</b> may include emissions with an elevated gamut property relative to an emissions of a peripheral output region R<b>2</b>.

0186<figref idref="DRAWINGS">FIG. 26A</figref> illustrates a retrofit element <b>1730</b> for a lighting device that includes a light-transmissive element <b>1731</b> containing a light-affecting material, a support element <b>1733</b>, and an attachment structure <b>1735</b> arranged for removable attachment to a base or body structure of a light bulb. One or more support elements <b>1733</b> may include one or more rigid wires or other narrow elements preferably arranged for only minimal blocking of light. The light-affecting material is suitable for affecting (e.g., increasing) gamut of emissions transmitted therethrough. In certain embodiments, the light-transmissive element <b>1731</b> may be arranged to cover only a portion of a light-emitting surface of a lighting device.

0187<figref idref="DRAWINGS">FIG. 26B</figref> illustrates an assembly <b>1750</b> including the retrofit element <b>1730</b> of <figref idref="DRAWINGS">FIG. 26A</figref> attached to a base or body structure <b>1705</b> of a lighting device <b>1700</b> that includes a light-transmissive globe or cover <b>1720</b> bounding a cavity <b>1725</b> including at least one electrically activated emitter <b>1710</b> arranged therein. The lighting device <b>1700</b> further includes a lateral contact <b>1706</b> and a foot contact <b>1707</b> arranged for mating with an Edison-type threaded light bulb socket. As shown in <figref idref="DRAWINGS">FIG. 26B</figref>, the light-transmissive element <b>1731</b> containing a light-affecting material is arranged to cover only a portion of the light-transmissive globe or cover <b>1720</b> of the lighting device <b>1700</b>, so that only a portion of emissions generated by the lighting device <b>1700</b> interact with light-affecting material. The attachment structure <b>1735</b> may include at least one threaded, snap-fit, compressive, or adhesive fastener suitable for mating with the base or body structure <b>1705</b>. In certain embodiments, the attachment structure <b>1735</b> may include a collar arranged to mate with the base or body structure <b>1705</b>, and the support elements <b>1733</b> may be arranged for removable insertion into recesses (not shown) defined in the attachment structure <b>1735</b>. Other removable attachment means will be apparent to one skilled in the art. In operation of the assembly <b>1750</b> including the lighting device <b>1700</b>, a first portion of emissions generated by the at least one electrically activated emitter <b>1710</b> is transmitted through the light-transmissive globe <b>1720</b> to impinge on the light-transmissive element <b>1731</b> of the retrofit element <b>1730</b> and interacts with light-affecting material therein to affect (e.g., increase) a gamut property of such emissions. A second portion of emissions generated by the at least one electrically activated emitter <b>1710</b> escapes the assembly <b>1750</b> without impingement on the light-transmissive element <b>1730</b>. In certain embodiments, a first (e.g., central) output region R<b>1</b> may include emissions with an elevated gamut property relative to an emissions of a second (e.g., peripheral) output region R<b>2</b>. In this manner, different beams or emission portions having different gamut properties may be cast in different directions when exiting the assembly <b>1750</b> including the lighting device <b>1700</b> and the retrofit element <b>1730</b>.

0188<figref idref="DRAWINGS">FIG. 27</figref> is a graph <b>1850</b> plotting radiant flux versus wavelength for a spectral output of a solid state light-emitting device with superimposed notch filtered spectral output, as relating to certain embodiments that may include one or more notch filtering materials. Curve <b>1852</b> is a plot of measurements taken of the light output of an LED lamp constructed including a multi-chip LED component in a mineral-oil filled, plain glass enclosure. Curve <b>1854</b> is a plot of measurements taken of the light output of an LED lamp that is the same in most respects, except that the enclosure for the lamp measured for curve <b>1854</b> is neodymium oxide doped glass. A notch is clearly visible between 550 nm and 650 nm wherein radiant flux is reduced due to filtering by the neodymium oxide notch filtering material. Measurement <b>1856</b> represents the width of the notch corresponding to the comparative reduction in light intensity at half the maximum reduction caused by the notch, otherwise known from the field of signal processing as the full width at half the maximum (FWHM). Relative to the peak radiant flux of approximately 4.3 mW/nm, the notch filtered region includes a radiant flux trough of between 1.5-2 mW/nm. The difference between the two curves <b>1852</b>, <b>1854</b> represents attenuation or reduction of light intensity. The notch shown in <figref idref="DRAWINGS">FIG. 27</figref> is characteristic of neodymium oxide filtering material by including a relatively sharply sloping (“hard”) shape profile and is more of a true “notch,” as opposed to a filtered shape with a more gently sloping or “soft” notch that may be more characteristic of filtering materials such as color pigments.

0189<figref idref="DRAWINGS">FIG. 28</figref> provides a line chart <b>1900</b> illustrating spectral transmittance versus wavelength for an illustrative color pigment material arranged to provide a spectral notch <b>1902</b> centered at about 580 nm. Transmittance of the color pigment material is nearly 100% at or below wavelengths of about 430 nm, and at or above wavelengths of about 730 nm. Between 430 nm and 730 nm, transmittance is reduced (to a minimum of about 50% at a wavelength of about 580 nm). As shown in <figref idref="DRAWINGS">FIG. 28</figref>, a color pigment may provide a softer spectral notch (with more gradually sloping wavelength attenuation) characteristic relative to other notch filtering materials such as rare earth metals and their oxides (e.g., as shown in <figref idref="DRAWINGS">FIG. 27</figref>).

0190Embodiments as disclosed herein may provide one or more of the following beneficial technical effects: enhanced aesthetics of emissions of lighting devices; enhancing perceived quality of emissions of lighting devices; enhancing vividness of colors represented by lighting devices; and permitting multiple surfaces or objects to be illuminated with different vividness by a single lighting device.

0191Those skilled in the art will recognize improvements and modifications to the preferred embodiments of the present disclosure. All such improvements and modifications are considered within the scope of the concepts disclosed herein and the claims that follow. Any of the various features and elements as disclosed herein may be combined with one or more other disclosed features and elements unless indicated to the contrary herein.